French Onion Soup au Gratin Stuffed Burgers

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Epic beef burgers stuffed with caramelized onions and topped with more onions plenty of cheese.

Ingredients for 4 servings

For the onions

1 Tablespoon olive oil
2 onions, halved and thinly sliced
1/2 teaspoon kosher salt
1/4 teaspoon pepper
1/2 Tablespoon fresh thyme or 1/2 teaspoon dried thyme
1/4 cup beef broth
1/4 cup red wine (or additional beef broth)

For the French onion spread

1/4 cup mayonnaise
1/4 cup plain Greek yogurt
2 Tablespoons of the onion mixture
1 teaspoon dijon mustard
1 teaspoon minced fresh parsley or 1/4 teaspoon dried parsley
pinch salt and pepper, to taste

For the burgers

1 1/3 pounds lean ground beef
1 Tablespoons minced fresh parsley or 1 teaspoon dried parsley
1/2 teaspoon pepper
1 teaspoon kosher salt
4 oz gruyere cheese, shredded, divided
4 brioche buns (or gluten free buns, if needed), sliced open
Bibb or butter lettuce