Crockpot Cheeseburger – Fustini's Oils & Vinegars

Ingredients

• 3 pounds 93% lean ground beef
• 1 tablespoon Fustini's Garlic olive oil
• 1 sweet onion, diced
• 2 garlic cloves, minced
• 1 tablespoon Fustini's 18 Year balsamic
• 1/2 teaspoon salt
• 1/2 teaspoon pepper
• 3 tablespoons ketchup
• 3 tablespoons mustard
• 1 tablespoon Worcestershire sauce
• 6 ounces sharp cheddar cheese, cut into cubes + more for topping
• buns, lettuce, tomato, any other burger toppings