Super Easy Chicken Manacotti

1 Jar spaghetti sauce (25.5 oz)
1 tsp garlic salt
1 1/2 lbs chicken breast, cubed
14 uncooked manicotti shells
1 can (2 1/2 oz) sliced olives
2 cups shredded mozzerella cheese

Spread 1/3 of the spaghetti sauce in a 9X13 baking dish. Sprinkle garlic salt on the chicken. Cube the chicken and don't cook it. Insert into uncooked manicotti shells, stuffing each end if necessary. Place shells in dish. Pour remaining sauce over the opt. Sprinkle olives and cheese on top. (I actually skip the olives, because it's always sounded a little weird.) Cover and store overnight in your fridge. (This sounds good for Sunday, right?) Bake the next day for about 1 hour.