Italian Stuffed Shells

Jumbo shells (1/2 box (This will depend on how full you stuff them))

Ground sausage (1/2 lb)

Ground beef (1/2 lb)

Cream cheese (4 oz)

Italian seasoning (1 tsp)

Garlic powder (1 tsp)

Marinara sauce (1 1/2 cup (divided))

Mozzarella cheese (shredded, 1/2 cup)