Root Beer Baked Beans

Name: Root Beer Baked Beans
Ingredients: 1 Tablespoon oil; 1 cup diced onion; 2 cloves garlic, (minced); 2 (15 ounce) cans pinto beans, (drained and rinsed); 2 (15 ounce) cans kidney beans, (drained and rinsed); 2 (15 ounce) cans cannellini beans, (drained and rinsed); 2 (12 ounce) bottles root beer ( (like IBC Root Beer)); 1/2 cup apple cider vinegar; 1/2 cup ketchup; 3 Tablespoons brown sugar; 2 Tablespoons dijon mustard; 2 teaspoons chili powder; 1 1/2 teaspoons kosher salt; 1 teaspoon ground black pepper