01 -
Set oven to 350°F and line a baking sheet with parchment paper.
02 -
In a large mixing bowl, beat the softened butter, granulated sugar, and brown sugar together until light and fluffy.
03 -
Mix in the egg and vanilla extract until fully incorporated.
04 -
Whisk together the flour, baking soda, baking powder, and salt in a separate bowl.
05 -
Gradually blend the dry mixture into the wet mixture until just combined.
06 -
Gently fold 1 cup of red and green M&Ms into the cookie dough.
07 -
Scoop tablespoon-sized amounts of dough and arrange them on the prepared baking sheet.
08 -
Press the remaining 1/2 cup of M&Ms onto the tops of each dough ball.
09 -
Bake for 10-12 minutes until the edges are lightly golden. Cool cookies on the baking sheet for 5 minutes, then transfer to a wire rack.