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French Onion Patty Melt

French Onion Patty Melt stacks caramelized onions, seasoned beef, Gruyère, and aioli on Texas toast—grilled to golden, melty perfection.
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Ingredients
  

Patty Melt

  • 3  Tbsp butter
  • 3 yellow onions thinly sliced
  • 2  lb ground beef
  • 1  Tbsp ketchup
  • ½  tsp garlic powder
  • 1  tsp salt
  • ½  tsp pepper
  • 2  cups shredded Gruyère cheese
  • 12 slices Texas toast
  • 8  tsp mayonnaise

Aioli Spread

  • ⅓  cup mayonnaise
  • 1  Tbsp lemon juice
  • 1  tsp pepper
  • 1  Tbsp minced garlic ~3 cloves
  • 1  tsp chopped fresh parsley
  • 1  Tbsp ketchup

Instructions
 

  • Melt butter in a skillet over medium-low. Cook onions for 15–20 minutes, stirring often, until deep golden. Add water if needed to prevent sticking. Set aside.
  • Mix beef with garlic powder, salt, pepper, and ketchup. Shape into 8 thin square patties. Cook in skillet over medium-high heat, 1–2 minutes per side. Set aside.
  • Whisk mayo, lemon juice, pepper, garlic, parsley, and ketchup in a bowl.
  • Spread aioli on 8 slices of bread. On 4 slices, layer cheese, patty, onions, second patty, more onions, more cheese. Top with another slice of aioli bread. Spread 1 tsp mayo on top slice.
  • Cook sandwiches mayo-side down in a skillet with a press, 3 minutes per side, until golden and melty.
  • Slice diagonally and serve hot.