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Caramelized Onion & Mushroom Cheeseburgers

Name: Caramelized Onion & Mushroom Cheeseburgers
Cook time: 15 min
Total time: 15 min
Yield: 4 servings
Ingredients: 8 tsp avocado oil (divided); 1 medium yellow onion (sliced to yield about 1 cup); 2 cups sliced cremini mushrooms; 1 tsp salt-free garlic and herb seasoning; 1 lb lean ground beef (formed into four 3/4-inch thick patties); 1/2 tsp barbecue rub seasoning; 4 pretzel bun or roll; 2 tbsp mayonnaise; 2 tbsp barbecue sauce