Ingredients

• 2  Tbsp. olive oil
• 1  large sweet onion, halved and thinly sliced (about 3 cups)
• 4  refrigerated or frozen vegetable burgers (10-oz. pkg.)
• 2  Tbsp. mayonnaise or salad dressing
• 1  tsp. prepared yellow mustard
• 4  1/2-inch slices ciabatta bread, toasted
• 1  cup fresh baby spinach leaves
• 2  Tbsp. steak sauce

Directions

1. In large skillet heat olive oil over medium-high heat. Add onion slices and cook 8 to 10 minutes or until very tender, stirring frequently.

2. Meanwhile, prepare burgers according to package microwave directions.

3. In small bowl combine mayonnaise and mustard; spread mixture on one side of each bread slice. Top bread with spinach and burger. Stir steak sauce into cooked onions. Spoon onion mixture on burgers. Makes 4 servings.