• 2 tablespoons olive oil
  • 1 large sweet onion , halved and thinly sliced (about 3 cups)
  • 4 veggie burgers (10-oz. pkg.)
  • 2 tablespoons mayonnaise or 2 tablespoons salad dressing
  • 1 teaspoon prepared yellow mustard
  • 4 1/2 inches slice ciabatta , toasted
  • 1 cup fresh baby spinach leaves
  • 2 tablespoons steak sauce
  • 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.