Averie Cooks

0 To the bowl of a stand mixer fitted with the paddle attachment (or large mixing bowl and electric mixer) combine the butter, sugars, egg, vanilla, and beat on medium-high speed until creamed and well combined, about 4 minutes.
1 Stop, scrape down the sides of the bowl, and add the flour, pudding mix (or cornstarch), baking soda, optional salt, and beat on low speed until just combined, about 1 minute.
2 Stop, scrape down the sides of the bowl, and add the chocolate chips, 3/4 cup M&M's, and beat on low speed until just combined, about 30 seconds.
3 Using a large cookie scoop, 1/4-cup measure, or your hands, form 15 equal-sized mounds of dough, roll into balls, and flatten slightly.
4 Add about 1 tablespoon M&M's to the top of each dough mound.
5 Place mounds on a large plate or tray, cover with plastic wrap, and refrigerate for at least 2 hours, up to 5 days. Do not bake with unchilled dough because cookies will bake thinner, flatter, and be more prone to spreading.
6 Preheat oven to 350F, line a baking sheet with a Silpat or spray with cooking spray. Place dough mounds on baking sheet, spaced at least 2 inches apart (I bake 8 cookies per sheet).
7 Bake for 11 minutes, or until edges have set and tops are just set, even if slightly undercooked, pale, and glossy in the center. Cookies firm up as they cool.
8 Allow cookies to cool on baking sheet for about 10 minutes before serving. I let them cool on the baking sheet and don’t use a rack.