Line a quarter sheet pan (9″x 13″) with parchment paper then line with graham crackers.
Melt together butter and sugar on medium heat for 8-10 minutes, stirring frequently, until mixture bubbles and turns a caramel color. Take off heat.
Pour butter mixture over graham crackers. Gently spread out evenly using a butter knife or offset spatula.
Top with chocolate and white chips.
Wait 5 minutes, then spread out the warmed chocolate using a butter knife or an offset spatula.
Top with sprinkles, cool for at least an hour, and break up to serve.