Heat oven to 400 degrees.

Place carrot, onion, garlic and spinach in food processor. Process until the vegetables are minced.

Add veggie mixture, along with the rest of the ingredients, into a large bowl and mix thoroughly. Hands work best for this.

Place a cooling rack on a cookie sheet. Spray liberally with cooking spray. Roll meat mixture into meatballs and place on the cookie sheet. Cook meatballs in 400 degree oven for 20 minutes, or until cooked through.

Open rolls and place on a cookie sheet. Broil for 30 seconds-1 minute. Be sure to watch closely.

Now assemble your sandwiches. Place 2-3 meatballs on a roll. Top with marinara sauce and a slice of cheese. Bake in a 350 degree oven for 10 minutes, or until the cheese is bubbly.