Vanilla Cake Mix Cookies

box gluten-free yellow cake mix, or 1 recipe Gluten Free Vanilla Cake Mix

unsalted butter, at room temperature

eggs (100 g, out of shell) at room temperature, beaten

M&Ms minis (or an equal amount, by weight, regular M&Ms)*

*Most varieties (including plain and mini) of M&Ms are gluten free in the U.S. If they’re not gluten free where you live, try using any other mix-in you like. Chocolate chips (regular or mini) would be great.