Step 1

Heat oven to 375ºF.

Step 2

Combine first 5 ingredients, 3/4 cup mozzarella and 2 Tbsp. Parmesan. Shape into 18 meatballs, using about 2 Tbsp. for each; place on rimmed baking sheet sprayed with cooking spray.

Step 3

Bake 15 min. or until done (160ºF). Meanwhile, cook spaghetti as directed on package, omitting salt and heat pasta sauce in separate saucepan.

Step 4

Drain spaghetti; place on platter. Combine meatballs and sauce; spoon over spaghetti. Top with remaining cheeses.