Ingredients
→ Brownie Base
 1 cup unsalted butter, melted (2 sticks)
 2 cups regular sugar
 4 large eggs, room temperature
 2 teaspoons vanilla
 1½ cups all-purpose flour
 ½ teaspoon salt
→ Mix-ins & Toppings
 1 cup white chocolate chips
 1 cup colorful M&M’s, plus extra for sprinkling on top