Dry ingredients:

• 3 cups flour
• 1 cup sugar
• 1 1/2 cup brown sugar
• 1 teaspoon baking powder
• 1 teaspoon salt

Wet ingredients:

• 2 eggs
• 1 egg white
• 1 teaspoon vanilla extract
• 3 sticks of butter, softened (leave out for ~30 minutes to soften)
  
  
• 3 cups M&Ms
• 1 cup semi-sweet chocolate chips

1. Mix dry ingredients together in order, then sift to break up any remaining chunks.
2. Beat eggs and vanilla in a separate bwol until frothy; add butter & mix well.
3. Using your hands (scrub & dry first!), slowly incorporate wet ingredients into dry.
4. Add M&Ms and chocolate chips and mix well.
5. Chill bowl of cookie dough in the refrigerator for at least 10 minutes, up to 24 hours (if planning to chill for longer than an hour, cover with plastic wrap to protect the dough from ambient refrigerator flavors).
6. Preheat oven to 365° F.
7. Place golf ball-sized cookie dough mounds on ungreased baking sheets.
8. Bake for 16-18 minutes, until cookies start to turn golden brown.
9. Pull sheets out of oven and place them on a smooth, heat-resistant surface. Let cookies rest for ~5 minutes, then move to racks to finish cooling.