Preheat oven to 350°F. Line a large sheet pan with a silicone baking mat and set aside. To bring the cream cheese and butter to room temperature, you can leave them out for 1 hour or microwave the unwrapped cream cheese in 5–10 second increments until soft. For the butter, microwave it for 5 seconds, flip it, then microwave for another 5 seconds. Be careful not to melt or overly soften either ingredient.: You will smell a faint warmth as the oven comes to temperature, and the kitchen begins to feel like home. Setting the oven to 350 F ensures a steady rise and even bake, which is critical for achieving a tender center and slightly set edges. Be mindful of oven hot spots; rotate the pan halfway through baking if your oven runs uneven. A common error is popping cookies into an oven that has not fully reached temperature, which can lead to uneven spread and underbaked centers.
In a large bowl fitted to a stand mixer (or use a hand mixer), cream together the cream cheese and butter until smooth. Beat in the egg, vanilla, and optional peppermint extract. Beat until mostly smooth.: When you gently press the cream cheese and butter they should give slightly but not melt, which creates a smooth emulsion when creamed. The right temperature helps the fats incorporate air, lending lift and tenderness. Avoid overheating in the microwave, as melted fats will cause greasy, flat cookies. If you notice lumps after microwaving, let the dairy cool a touch and stir by hand to smooth before mixing.
Add in the dry pudding mix and brownie mix. Beat to combine. The dough is thick; just keep mixing and it will all come together.: This quick method softens butter evenly without melting, and you should still see a pale color and hold. The sound of slightly soft butter being creamed will change from a dense thud to a lighter, fluffier rhythm, signaling proper incorporation. If you hear sloshing or see pooling, stop immediately, chill briefly, and then proceed to prevent over softening which causes spreading.
Stir in coarsely chopped peppermint bark, chocolate chips, and optional white chocolate chips. Cover dough tightly and chill for 1 hour.: The ideal tactile cue is that the fats yield under gentle pressure but keep their shape. Keeping them at this stage prevents over spread and maintains the chewy center. If you accidentally melt them, you can chill the mixture briefly to firm up before mixing, which saves the batch from becoming overly thin on the bake.
Measure each cookie dough ball to be a full, packed 2 tablespoons of dough. Knead the dough ball to get the chocolate chips to stick in and roll it into a ball. Slightly flatten balls to about 1/2-inch thick. You should get about 26–28 cookies from this batter. Place 6–8 cookies on the prepared cookie sheet, giving cookies ample room to spread.: As you cream, listen for the mixer picking up pace and watch the texture become glossy and unified, signaling proper emulsification. This glossy sheen means the fats have trapped tiny air pockets, which will contribute to structure and tenderness when baked. A typical mistake is undercreaming, leaving pockets of butter, so scrape the bowl periodically to ensure an even blend.
Bake each batch for 10–14 minutes. Remove from the oven. Sometimes the edges have a tendency to leak out; right out of the oven, simply use the back of a metal spatula to press the edges in toward the center of the cookie. If desired, add some additional chocolate chips or chopped peppermint bark on top of the cookies. Repeat with the remaining cookie dough until all the cookies are baked.: The mixture will momentarily look softer and more fluid as the egg incorporates, and the aroma of vanilla will brighten the whole bowl. Adding extracts at this point helps preserve their fragrance, which can otherwise fade with extended mixing. Overmixing once the egg is added can develop too much gluten when combined with dry mixes, so mix just until mostly incorporated.
Beat until mostly smooth.: You want a largely homogeneous batter with small flecks from the dairy, not a completely flat mass. The batter should feel dense and moist to the touch. If you see separation or curdling, mixing more slowly and scraping the bowl often will usually bring it back together; severe separation may require chilling and rebeating for stability.
Add in the dry pudding mix and brownie mix.: When the instant pudding and brownie mix hit the bowl the batter will thicken noticeably, and you may see streaks of cocoa. These mixes deliver structure and concentrated chocolate flavor, and the batter should become very thick as they absorb moisture. If your mixer struggles or the paddle binds, pause and scrape the sides to prevent overheating the motor, since thick dough can be taxing on appliances.
Beat to combine.: The dough will become dense and hold its shape. The sound of mixing shifts from a whisking hum to a deeper, more strained beat, signaling a very thick dough. Resist adding extra liquid even if it seems dry, because the dough firms up with chilling. Overworking here can make the cookies tough, so stop as soon as the dry mix is fully blended.
The dough is thick, just keep mixing and it will all come together.: The texture should feel almost like a brownie batter but firmer, with a slight tackiness when touched. This density is why chilling is essential prior to shaping, it allows the fats to solidify and prevents excessive spread. If it looks crumbly, a brief pulse of the mixer or a few drops of milk can help, but add sparingly.
Stir in coarsely chopped peppermint bark, chocolate chips, and optional white chocolate chips.: As you fold in the peppermint bark and chocolate chips , watch how they distribute and nestle into the dough, providing visual contrast and texture. The clinking of bark against the bowl and the sight of chips peeking through tell you that each cookie will have pockets of flavor. A common slip is overmixing at this stage which can crush the chips and make the dough overly soft, so fold gently until even.
Cover dough tightly and chill for 1 hour.: Chilling firms the dough and deepens flavor, and you will notice it becomes easier to scoop and less sticky. The cold dough also controls spread in the oven, producing a more desirable shape with set edges and soft centers. Skipping this step often results in thin, flat cookies, so plan ahead and give the dough the hour it needs.
Measure each cookie dough ball to be a full, packed 2 tablespoons of dough.: Using a measuring spoon or scoop creates uniform cookies that bake at the same rate. The packed measure ensures enough density so centers stay fudgy while edges set. An inconsistent scoop can yield some cookies underbaked and others dry, so strive for consistent portions.
Knead the dough ball to get the chocolate chips to stick in and roll it into a ball.: The tactile act of kneading smooths the surface and nests chips within, which helps them stay embedded during baking. You will feel the chips shift slightly and notice a smooth outer shell forming, which leads to even browning. Avoid over kneading which can warm the dough and start melting chips prematurely.
Slightly flatten balls to about 1/2 inch thick.: Flattening gives the cookies a uniform height so they bake evenly and develop those appealing crackly tops. You should see the edges firm while the centers remain puffy, and any thin spots will brown too quickly. If the dough becomes too warm while shaping, return balls to the fridge briefly to re-firm them.
You should get about 26 to 28 cookies from this batter.: When portioned correctly you will see a consistent yield and a satisfying sense of abundance. If your cookies come out larger or smaller, adjust your servings accordingly and note the new bake time, as size changes baking characteristics. Consistency here helps with timing and storage planning.
Place 6 to 8 cookies on the prepared cookie sheet, giving cookies ample room to spread.: As the tray slides into the oven you will hear a soft hiss and later a gentle crackle as edges set and sugars caramelize. Leaving adequate space prevents merging and promotes even heat circulation. A frequent error is overcrowding, which yields misshapen, stuck together cookies.
Bake each batch for 10 to 14 minutes.: Watch for the scent of chocolate deepening and the tops setting with a slight sheen, which are cues that they are nearly done. The edges should appear set while the centers are still soft to the touch, and the bottoms should be firm but not hard. Overbaking will dry them out, so rely on these sensory cues rather than the clock alone.
Remove from the oven.: When you pull the pan out you will feel a warm wave of chocolate aroma and notice the cookies continue to cook slightly from residual heat. Letting them sit for a few minutes on the hot pan helps set the exterior while the centers remain tender. Taking them off too soon can cause collapse, while leaving them too long can make them tough.
Sometimes the edges have a tendency to leak out, right out of the oven simply use the back of a metal spatula to press the edges in toward the center of the cookie.: This quick adjustment corrects spreading and helps maintain a round shape, creating a rustic but tidy appearance. The spatula should glide beneath the cookie with minimal resistance and the adjustment will firm up as the cookie cools. If edges are consistently leaking, chill dough longer next time to prevent repeat issues.
If desired, add some additional chocolate chips or chopped peppermint bark on top of the cookies.: Topping while warm lets chips and bark adhere and creates an attractive finish. The added pieces will slightly melt and set, giving glossy highlights. Be cautious not to press too hard, which can flatten the cookies and change the texture profile.
Repeat with the remaining cookie dough until all the cookies are baked.: Each batch provides an opportunity to refine timing and placement, and you may notice subtle differences between early and later trays as the oven stabilizes. Keep cooled batches on a wire rack to prevent sogginess, and store completely cooled cookies in an airtight container to preserve texture.