Crockpot Philly Cheesesteak

Ingredients (14)

• 1 beef bouillon cube
• 13/4 cups hot water
• 1 tablespoon Worcestershire sauce
• 1 teaspoon salt
• 1 teaspoon ground black pepper
• 1 teaspoon garlic powder
• 1 teaspoon Italian seasoning
• 2 pounds top sirloin steak, cut into very thin strips
• 1 medium red bell pepper, sliced thin (about 1 cup)
• 1 medium green bell pepper, sliced thin (about 1 cup)
• 1 medium white onion, sliced thin (about 1/2 cup)
• 6 hoagie buns, sliced in half lengthways
• 3 tablespoons butter
• 6 slices provolone cheese, cut in strips