If you're looking for an easy-to-make snack that's both delicious and high in protein, then these four-ingredient peanut butter bars are for you. All you need is peanut butter, graham cracker crumbs, powdered sugar, and chocolate chips. To make these bars, just combine 2 cups of graham cracker crumbs, 1 ½ cups of creamy peanut butter, and 1 ½ cups of powdered sugar. Heat up the chocolate chips in 30-second intervals until they're completely melted, then pour the chocolate over the graham cracker and peanut butter base. Each cup contains about 65 grams of protein, meaning that these bars, which use 1 ½ cups of peanut butter, contain about 97.5 grams total.