Slow Cooker Italian Beef

2 lbs sliced roast beef ($8.00)
1 box beef broth (had in pantry)
1 can Progresso French Onion soup (had in pantry)
1 green pepper sliced thin (had in fridge)
1 tbsp minced garlic (already have)
1 bag shredded mozzarella ($2.79)
Hoagie buns ($3.00)

let slow cook for 4-6 hours on low