Mushroom Swiss Burgers With Truffle Aioli

Caramelized onions, mushrooms, and Swiss cheese smother this burger in a blanket of deliciousness. It’s easy to prepare, but it looks like it’s from a fancy steakhouse. We served it on a decadent brioche bun and topped it all with a homemade truffle aioli. If you can’t find truffle oil, the sauce is just as delicious without it. You can also make homemade buns if you like.

Serve these babies on a weeknight or for a fun dinner party. Some crispy fries on the side are a must.

Ingredients:

For the Burgers:

• 5 tablespoons butter, divided
• 1 small onion, thinly sliced
• 2 teaspoons salt, divided
• 2 cups mushrooms, sliced
• 1 teaspoon Worcestershire sauce
• 1/2 teaspoon dried thyme
• 4 brioche burger buns
• 4 (3-ounce) ground beef burger patties
• 1 teaspoon ground black pepper
• 1 cup Swiss cheese, or Gruyère, shredded

For the Truffle Aioli:

• 1/2 cup mayonnaise
• 1 teaspoon salt
• 1/2 teaspoon ground black pepper
• 1 teaspoon lemon juice
• 1/2 teaspoon truffle oil
• 1 garlic clove