Prep the pan: Heat the oven to 350°F (175°C). Line a 12-cup muffin pan with paper liners.
Mix dry ingredients: In a large bowl, whisk flour, sugar, cocoa, baking powder, baking soda, and salt until well combined.
Mix wet ingredients: In a separate bowl, whisk buttermilk, oil, egg, and vanilla until smooth.Stir into the dry mixture until just combined.
Add hot liquid: Pour in the hot coffee or water and whisk gently. The batter will be thin; that’s normal. Don’t overmix.
Fill and bake: Divide the batter evenly among the liners, filling each about two-thirds full.Bake 16–20 minutes, or until a toothpick comes out clean. Cool in the pan 5 minutes, then transfer to a rack to cool completely.
Make the frosting: Beat butter until creamy. Sift in powdered sugar and cocoa, then beat on low until combined.Add vanilla, salt, and 2 tablespoons cream. Beat on medium-high until fluffy, 1–2 minutes, adding a splash more cream if needed for a spreadable consistency.
Melt the chocolate: In a microwave-safe bowl, heat chocolate chips with coconut oil in 20–30 second bursts, stirring between each, until smooth. Or use a double boiler.Let cool for 3–4 minutes so it’s warm but not hot.
Make the nests: Gently fold the cereal/noodles into the melted chocolate until coated. On a parchment-lined tray, spoon small mounds (about 2 tablespoons each). Use the back of the spoon to press a shallow well in the center, forming a nest.You’ll need 12. Chill 10–15 minutes to set.
Frost the cupcakes: Once cupcakes are fully cool, pipe or spread a generous swirl of frosting on top. A flat, slightly domed layer works well as a base.
Assemble: Place a chocolate nest on each cupcake.Add 2–3 mini eggs to the center. Press gently so they stay put.
Serve: Enjoy right away, or chill briefly to firm things up if your kitchen is warm.