Hot Fudge Brown Butter Skillet Cookie

INGREDIENTS

1 cup

unsalted butter, softened to room temperature

2/3 cup

light brown sugar, packed

1/2 cup

dark brown sugar, packed

2 tsp

vanilla extract

1/2 cup

granulated sugar

large egg

large egg yolk

2 1/4 cups

all-purpose flour

1 tsp

salt

1 tsp

baking soda

1/2 cup

fudge sauce (homemade or store bought)

3/4 cup

semi-sweet chocolate chips

1/2 cup

white chocolate chips