Grease the slow cooker with cooking spray and pour ½ cup pizza sauce into the bottom.

Unroll the pizza crust and cut into 30 pieces. Roll each piece into a ball and place on top of the pizza sauce.

Layer the pepperoni and sausage over the pizza balls. Top with mozzarella cheese and remaining pizza sauce.

Place the lid on the slow cooker, placing a paper towel under the lid to catch any condensation. Cook for 1 ½ to 2 hours on high, or until crust is cooked through and cheese is melted.

Serve warm.