Prepare your brownie mixture and bake in a 9x13 pan according to package directions. Allow to cool to room temperature.

In a food processor, add the peanut butter, powdered sugar, butter and graham crackers. Pulse until the mixture is smooth and well combined. (If you don't have a food processor, crush your graham crackers into fine crumbs and combine with the other ingredients in a bowl with a beater. The mixture won't be quite as smooth, but will still taste great!)

Dollop the mixture over the brownies and carefully spread it out evenly.

Using a heart cookie cutter, cut out as many hearts as possible.

In a microwave safe bowl, heat the chocolate chips and oil in 20 seconds increments, stirring vigorously until smooth.

Spread the top of each heart brownie with 1 teaspoon melted chocolate and top with sprinkles. Store refrigerated.