Peanut Butter Chocolate Chip Muffins

Flour (2 cups)

Salt (1/2 tsp)

Baking powder (2 tsp)

Peanut butter (2/3 cup)

Unsalted butter (room temperature, 2/3 cup)

Brown sugar (2/3 cup)

Eggs (2)

Milk (1 cup)

Peanut butter and chocolate chips (1 cup)