0.5 cup mini candy-coated milk chocolate (such as M&M's®)
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0.5 cup chocolate chips
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0.25 cup multicolored candy sprinkles
Instructions
Cream together butter, brown sugar, and white sugar in a large bowl with an electric mixer until fluffy. Add egg, egg yolk, and vanilla paste; beat until well incorporated.
Add flour, cornstarch, baking soda, and salt and mix until a dough has formed. Stir in mini M&Ms, chocolate chips, and sprinkles. Cover dough and refrigerate for 6 hours or overnight.
Preheat oven to 350 degrees F (175 degrees C). Line 2 baking sheets with parchment paper.
Drop cookie dough by rounded tablespoon onto the baking sheet using a cookie scoop. If desired press in extra sprinkles and/or mini M&Ms on top of the cookie dough.
Bake in the preheated oven until cookies are starting to brown at the edges, 12 to 14 minutes. Transfer to a wire rack and allow to cool.