Ingredients
- 2 1/8 cups flour
- 1/2 tsp salt
- 1/2 tsp baking soda
- 12 Tbsp butter (1 1/2 sticks), melted and cooled slightly
- 1 cup brown sugar
- 1/2 cup white sugar
- 1 large egg
- 1 large egg yolk
- 2 tsps vanilla extract
- 1 12oz bag M&M's, divided
Preparation
Step 1
Preheat the oven to 325 degrees. Adjust the oven rack to lower-middle position. Grease a 9x13 pan and set aside.
In a medium sized bowl, whisk together the flour, salt, and baking soda and set aside.
In a large bowl, whisk the melted butter and sugars until combined. Add the egg, egg yolk, and vanilla and mix well. Using a rubber spatula, fold the dry ingredients into the egg mixture until just combined; do not overmix. Fold in 1 cup of M&M's and turn the batter into the prepared pan, smoothing the top with the spatula. Sprinkle remaining M&M's on top and press in slightly.
Bake 25-30 minutes, until the top of the bars is light golden brown, slightly firm to the touch, and edges start pulling away from sides of pan. Cool completely before cutting.