Preheat oven to 425 degrees.
Line 9×13 baking sheet with non-stick baking spray.
Line the pan with ritz crackers. They won’t fit perfectly but do your best to lay crackers out flat. Breaking crackers in half to fill entire space will help!
Over medium heat, melt butter, peanut butter and brown sugar until the sugar has just dissolved. Pour mixture over the ritz crackers and spread evenly to distribute.
Place in the oven preheated to 425 for about five minutes or until it just starts to bubble.
Remove from oven and add chocolate chips over the top.
Let chocolate chips sit about a minute, then using a spatula, spread evenly across the top of the pan. While chocolate is still melted, top with sprinkles if desired.
Place in freezer for about 15 minutes.
Break apart and enjoy!