Peanut Butter Cookies

Ingredients

• 1/2 cup butter
• 1/2 cup peanut butter
• 1/2 cup granulated sugar
• 1/2 cup brown sugar
• 1 egg
• 1/2 tsp. salt
• 1/2 tsp. baking soda
• 1/2 tsp. vanilla extract
• 1 cup all purpose flour
• 1/2 cup nuts, dried fruit, m&ms, quick oats, or chocolate chips (optional)