Addictive Sweet Potato Burritos

INGREDIENTS

• 1 tablespoon vegetable oil
• 1 onion, chopped
• 4 cloves garlic, minced
• 6 cups canned kidney beans, drained
• 2 cups water
• 3 tablespoons chili powder
• 2 teaspoons ground cumin
• 4 teaspoons prepared mustard
• 1 pinch cayenne pepper, or to taste
• 3 tablespoons soy sauce
• 4 cups cooked and mashed sweet potatoes
• 12 (10 inch) flour tortillas, warmed
• 8 ounces shredded Cheddar cheese