So you’re sizing it down x4, so you divide everything by four, so if you go down the list, this is what you’ll get:
Peanut Butter: 1 cup > 1/4 cup
Brown Sugar: 1 cup > 1/4 cup
Granulated Sugar: 1 > 1/4 cup
Butter: 1 > 1/4 cup
Eggs: 2 eggs > 1/2 egg
Baking Soda: 1 tsp > 1/4 tsp
Baking Powder: 1 tsp > 1/4 tsp
Vanilla: 1 tsp > 1/4 tsp
Flour: 2.5 cups > .625 cups