Mushroom Veggie Burgers | Savory

Ingredients

• 3 tbsp olive oil, divided
• 2 pkg (6 oz. each) small portobello mushrooms, sliced
• 1/4 cup chopped onion
• 1 pkg ( 1.4 oz.) dry vegetable soup /dip mix
• 1 can ( 15 oz.) black beans, rinsed and drained
• 2 cups quick-cooking rolled oats
• 1 egg
• 4 regular or whole-wheat hamburger rolls, toasted
• Toppings (optional): Lettuce, tomatoes, pickles, onions