First, microwave butter until melted. Pour heated butter into a large basin. Wait 15-20 minutes for room-temperature butter.Sift flour in another basin. Mix in baking powder, soda, and salt. Set aside.
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Add brown sugar and sugar to the butter bowl. Mix with a rubber spatula. Mix in eggs and vanilla. Combine.Pour flour into wet ingredients. Combine the batter by folding.
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Fold in small M&Ms and chocolate chips.Use parchment on two cookie sheets. Scoop dough with a 3oz cookie scoop. Use 6 cookie dough balls per sheet.
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Before baking, freeze the first cookie sheet for at least 10 minutes to chill the dough balls. Store the remaining cookie dough balls in the fridge.Heat the oven to 350°F. Bake each cookie sheet by itself.
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Bake until rims are golden brown, 13-15 minutes.While the cookies are heated, add micro M&Ms and chocolate chips. Transfer the cookies to a cooling rack after 5 minutes on the heated pan.
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