01 - Preheat oven to 350°F (175°C). Line a 12-cup muffin tin with paper liners.
02 - In a large mixing bowl, whisk together all-purpose flour, granulated sugar, baking powder, baking soda, and salt until evenly distributed.
03 - In a separate bowl, whisk eggs, melted unsalted butter, cream soda, whole milk, and vanilla extract until thoroughly combined.
04 - Gradually pour wet mixture into dry ingredients; stir gently until just combined to avoid overmixing.
05 - Fold in mini chocolate chips or rainbow sprinkles if desired.
06 - Evenly distribute batter among muffin cups, filling each approximately two-thirds full.
07 - Bake for 16 to 18 minutes, or until a toothpick inserted in the center of a muffin comes out clean.
08 - Transfer muffins to a wire rack and allow to cool completely before decorating.
09 - Divide frosting into several bowls and tint with assorted food colorings. Frost cooled muffins and use candy eyeballs to assemble monster faces. Allow creative decoration.