Preheat oven to 375 degrees. Spray a 12 cup standard muffin tin pan with non-stick cooking spray.
Roll out crescent dough onto a non-stick clean work surface. (If you are using the triangles, pinch together all seams to create 1 rectangle shape. Use a rolling pin to roll over dough to make sure seams are closed. DO NOT Roll dough out thinner, keep original size.)
Cut dough into 12 equal pieces. Place each piece of dough into the muffin tins and press to the bottom and sides.
Place 2 tsp marinara sauce on top of the dough in the muffin tins. Place 1 tsp of mozzarella cheese on top of the sauce. Sprinkle a little Italian seasoning on top. Place 1 frozen meatball on top of the cheese.
Place 1 tsp of marinara sauce over the meatball. Top with a small mound of shredded mozzarella cheese. Sprinkle with more Italian seasoning.Place muffin tin pan on a sheet pan. Place in preheated oven for 15-18 minutes until crescent dough is cooked through and browned. Meatballs should be heated through.
Let meatball bites sit in muffin tin for 5 minutes before removing to a serving dish.