Preheat the oven to 350 degrees fahrenheit. Prepare a 24 mini muffin pan by spraying with a baking spray that includes flour.: The air warms and you will smell that slight metallic warmth from the oven as it climbs to 350 degrees fahrenheit . A light film of baking spray that contains flour helps the tiny brownie cups release cleanly, so you avoid tearing edges. When I prepare pans, I tap them gently to check even coverage, and I wipe any excess spray from rims so batter sits neatly in each well. One common mistake is skipping the flour containing spray and using only oil, which can let the fragile mini cups stick and break when you unmold them. If you notice the spray pooling, blot with a paper towel before filling.
Prepare the brownie mix according to the package directions, or follow recipe directions. Fill mini muffin cups 2/3 full.: At this point the batter should be glossy and slightly thick, not gloopy or runny. Filling each cup about two thirds full gives the brownie room to rise into a domed, chewy bite without overflowing. As you spoon batter in, you will hear soft plops and see the wells fill with deep chocolate color. Use a small cookie scoop for consistency, and wipe excess batter off the rim to prevent baked spillage. A frequent slip up is overfilling, which leads to lopsided cups and sticky edges that are hard to remove. If your batter feels too stiff, stir in a tablespoon of water to adjust texture sparingly.
Bake for 7-10 minutes or until the edges are set but the centers are still soft, but not liquid.: During baking the kitchen fills with warm cocoa aromas and a hint of caramelized sugar. Watch for the edges to pull slightly away from the sides, and the center to appear matte rather than wet. The centers should jiggle gently when you nudge the pan, not slosh like batter. That slight wobble will set as they cool into a fudgy interior. Avoid overbaking because that robs the cups of their tender center and makes them cakier than intended. If you open the oven door too often, you risk temperature loss and uneven rise.
As soon as you remove them from the oven, press one kiss into each brownie cup with the pointed down, flat part on top. You can leave them as is or as soon as they begin to melt and soften you can use a thin spatula or a spoon to smooth out the chocolate and make it look more like cocoa!: The contrast of warm brownie and cool Chocolate Kisses creates a glossy domed center as the chocolate softens. Pressing the kiss while the cup is hot encourages it to melt just enough to become shiny and spread, and smoothing with a thin spatula gives a charming hot chocolate surface. Listen for a slight pop as the kiss settles, and watch for a gleam indicating the chocolate has softened. A common misstep is waiting too long to press the chocolate, resulting in only partial melting and uneven texture. If the kisses do not soften, place the pan back in the oven for thirty to sixty seconds, watching closely.
Allow the brownie cups to cool completely then transfer them to a cooling rack. While they are cooling, prepare the stabilized whipped cream.: Cooling changes the crumb structure, firming the edges and setting the glossy centers into a stable pocket. Moving them to a rack lets air circulate so condensation does not form under the cups. Meanwhile, chilling your tools for the whipped cream primes you for success, since a cold bowl helps the heavy whipping cream reach peaks faster. A mistake I sometimes see is piping on warm brownies, which melts the topping and ruins the presentation. Be patient and confirm they are fully room temperature before moving on.
Whip the heavy cream at high speed in a very cold bowl until it starts to thicken. Add the powdered sugar and continue beating until soft peaks will form. Next, add the mix and beat until stiff peaks form. Watch it carefully, as this can happen quickly. Don’t want to overmix or it will curdle.: As you whip, the heavy whipping cream goes from shiny liquid to billowy peaks with a soft whispering sound from the mixer. When it begins to thicken, the surface takes on a velvety look and the whisk leaves trails. Adding the powdered sugar sweetens and slightly stabilizes the foam, while the dry instant white chocolate pudding mix gives body and a subtle cocoa freshness. When stiff peaks form, the cream holds its shape but still yields comfortably under pressure. Overwhipping leads to grainy texture or even butter separation, so stop as soon as the peaks stand tall. If the mixture starts to look curdled, fold gently to reincorporate and chill briefly.
When the brownies are fully cooled you may pipe on the stabilized whipped cream. Garnish with mini marshmallows, pieces of peppermint sticks, sprinkles and chocolate sauce if desired.: Piping introduces a visual flourish, and you will feel the resistance of the bag as you build tall swirls of creamy white against the dark brownie . The aroma will shift to sweet and minty if you add crushed candy canes, and the contrasting textures of crunchy garnish and soft cream make each bite interesting. A common error is overfilling the cups with topping, which makes them hard to handle and eat neatly. Keep proportions balanced so the first bite includes all layers harmoniously.