Peanut Butter Chocolate Chip Cookie Cups

INGREDIENTS

1/2 cup

unsalted butter, melted

large egg

3/4 cup

light brown sugar, packed

1/2 cup

creamy peanut butter (I recommend storebought and not homemade which is much runnier)

1/4 cup

granulated sugar

1 tbsp

vanilla extract

1 1/2 cups

all-purpose flour

1/2 tsp

baking soda

teaspoon salt, optional and to taste

1 1/2 cups

semi-sweet chocolate chips, divided