Line a baking sheet with wax paper or parchment paper; set aside.: You will notice the smooth, slightly tacky surface of the paper as you place formed eggs onto it, which keeps them from sticking and makes transfer effortless. Having the sheet ready is important because once the filling is shaped, you want a clean surface to chill them on. A common mistake is to skip lining, which leads to delicate eggs tearing when removed. If the room is warm, place the tray briefly in the refrigerator before shaping to keep the filling cool to the touch.
In a medium saucepan, combine the peanut butter, butter, and brown sugar over medium heat. Heat until completely melted and starting to simmer, stirring constantly. Remove from the heat.: Sweet, nutty steam will rise as the peanut butter melds with melted butter and light brown sugar , releasing a warm aroma. Stirring constantly prevents the mixture from sticking and burning, and you should aim for a smooth, glossy texture before pulling it off the heat. This step builds the base flavor and ensures the sugar dissolves. Watch for any scorching; if you see dark specks, discard and start again, as burnt notes will carry through to the final candy.
Add the powdered sugar a 1/4 cup at a time, stirring until completely combined with the peanut butter mixture after each addition. Set aside and let cool to room temperature.: As you add powdered sugar , the mixture will thicken and lose some sheen, becoming dough like and slightly pliable. Stir thoroughly after each addition so there are no streaks of dry sugar. Cooling to room temperature is essential so the filling is firm enough to shape, and you will feel the mixture become less sticky. Rushing this step can lead to filling that oozes when dipped, so be patient and test a small scoop to see if it holds its shape.
Using a medium cookie scoop or a heaping tablespoon, scoop out peanut butter mixture and shape into eggs. I found it easiest to roll the scoop into a ball, and then roll it into a short cylinder. I placed it on the baking sheet, and then used my fingers to shape the ends into an egg-like oval. Refrigerate to allow the peanut butter eggs to set, about 30 minutes.: The tactile process of shaping is satisfying, you will feel the pliable filling come together in your hands as you roll it into an oval. I found it easiest to roll the scoop into a ball, and then roll it into a short cylinder. Placing them on the lined baking sheet, gently press the ends to create that classic egg silhouette. Refrigerate to allow the peanut butter eggs to set, about 30 minutes. If the mixture sticks to your hands, dampen them slightly or refrigerate the mixture for a few extra minutes. Overhandling can warm the filling too much, making them soft and harder to coat.
Once the peanut butter eggs are set, melt the chocolate chips and shortening together in the microwave on 50% power in 30-second increments, stirring after each, until completely melted. One at a time, dip a peanut butter egg into the chocolate and, using a fork, flip it over so it is completely covered. Remove it from the bowl, letting any excess chocolate drip off. Return it to the baking sheet, and repeat with all of the peanut butter eggs. Sprinkle with decorations, if desired.: The chocolate will transform from grainy clumps to a velvety liquid, releasing a comforting, sweet chocolate scent. Stirring between bursts distributes heat and prevents scorching, creating a glossy finish aided by the vegetable shortening . If you overheat, the chocolate can seize or become dull, so use short increments and stir frequently. A smooth, slightly viscous texture indicates it is ready for dipping.
Return the chocolate-covered peanut butter eggs to the refrigerator to allow the chocolate to set, about 30 minutes. The peanut butter eggs can be stored in an airtight container in the refrigerator for up to 1 month. They can be frozen for up to 3 months.: As you dip, listen for a soft rinse of chocolate and watch it flow around the egg into a silky coat. Use the fork to lift and let excess drip back into the bowl, then tap lightly on the bowl edge to remove extra chocolate so the coating is even. Work over the lined sheet and repeat with all eggs. A frequent slip up is dipping when the filling is not cold enough, which can cause the center to soften and lose shape. If that happens, chill the formed eggs a bit longer before continuing.
Remove it from the bowl, letting any excess chocolate drip off. Return it to the baking sheet, and repeat with all of the peanut butter eggs: After you set each coated egg down, the chocolate will begin to dull slightly as it cools, and you may see a thin ridge form around the base where excess chocolate pooled. That is normal and can be smoothed with a small offset spatula if you prefer. Keep the bowl warm but not hot to maintain a dip friendly viscosity. A common error is overcrowding the tray which can cause eggs to touch and stick together as they set.
Sprinkle with decorations, if desired: When you add decorations, they will press gently into the warm coating, adhering as it firms and adding a festive appearance. I like to vary textures, for instance a light dusting of colored sprinkles or crushed nuts, which contrast the glossy chocolate. Add decorations quickly after dipping so they stick, otherwise the chocolate may start to set and prevent adherence. Avoid heavy decorations that can weigh down the shell and cause indentation.
Return the chocolate-covered peanut butter eggs to the refrigerator to allow the chocolate to set, about 30 minutes: As they chill, the chocolate will harden into a crisp shell while the center remains creamy, creating that perfect textural contrast. You will see the surface go from glossy to slightly firmer and cooler to the touch. Proper chilling also helps the chocolate stabilize so it does not bloom as quickly. Leaving them at room temperature for too long may soften the center and make handling messy, so don’t skip this step.
The peanut butter eggs can be stored in an airtight container in the refrigerator for up to 1 month: Stored cold, they retain texture and freshness, and the chocolate stays intact. For longer keeping, freeze them for up to 3 months, wrapped well to prevent freezer burn. Thaw in the refrigerator before serving to avoid condensation on the chocolate. A mistake I see is storing them at room temperature in warm kitchens, which can make the chocolate sweat or the filling soften.