01 - Preheat oven to 350°F and line a 12-cup muffin tin with paper liners.
02 - In a medium bowl, sift together flour, cocoa powder, baking powder, baking soda, and salt until well blended.
03 - In a large bowl, whisk eggs and sugar until light and fluffy. Add milk, vegetable oil, and vanilla extract; blend until fully combined.
04 - Gradually add dry ingredients to wet mixture, stirring until just incorporated. Avoid overmixing to prevent tough cupcakes.
05 - Divide batter evenly among cupcake liners. Bake for 16-18 minutes, or until a toothpick inserted in the center comes out clean. Cool completely before decorating.
06 - Beat softened butter until creamy. Gradually mix in powdered sugar and cocoa powder. Add vanilla and 2 tablespoons milk; beat until fluffy and spreadable, adding more milk if needed.
07 - Generously frost cooled cupcakes with chocolate frosting, creating a smooth surface for decoration.
08 - Carefully twist Oreos apart, keeping cream on one side. Place two cream-sided halves on each cupcake as eyes.
09 - Press a brown candy on each cream-filled eye for pupils. Position an orange or yellow candy below the eyes as the beak. Optionally, place Oreo halves without cream on top corners as eyebrows.
10 - Serve immediately or store in an airtight container for up to 3 days.