Help me make Cheesesteak Burger.
Here's a recipe for Cheesesteak Burger:

Ingredients:

• 3/4 lb ground beef
• 1/2 tablespoon salt
• 1/2 tablespoon pepper
• 2 tablespoons white onion, diced, divided
• 1 slice provolone cheese, quartered
• 1 sesame bun, butter-toasted
• 1 green leaf lettuce
• 1 tablespoon white onion, diced

Instructions:

1. In a large bowl, combine the ground beef, salt, and pepper.
2. In a ramekin, spread two-thirds of the beef patty evenly along the bottom and the sides.
3. Place half the diced onion and provolone in the well.
4. Preheat the oven to 425°F (220°C).
5. Place the rest of beef patty on top and pat to flatten.
6. Place the ramekin on a baking sheet along with a sesame bun, face down.
7. Bake for 25 minutes.
8. Assemble the burger with the sesame bun, lettuce, and the rest of the onion.

Enjoy your Cheesesteak Burger!