To prepare a Uncle Mac's Peanut Butter and Jelly Cookies recipe, first you need to prepare your ingredients. First, you will need your peanut butter and jelly. You can find it at your local grocery store, or you can buy it online. Then, add your flour, baking powder, sugar, and salt to your mixing bowl and mix until everything is well combined. Next, take your cookie dough and roll it into balls and place them on the greased cookie sheet. Bake the cookies for 10 to 12 minutes or until they are golden brown.