Low Carb Sloppy Joe Boats

Ingredients:

1 lb ground beef
6 Romaine lettuce leaves
8 oz tomato sauce
½ green pepper, chopped
⅓ onion, chopped
3 tablespoons garlic, minced
2 teaspoons chili powder
¾ teaspoon mustard powder
3 tablespoons reduced sugar ketchup
½ teaspoon salt
¾ teaspoon pepper

Directions: