French Onion Fajita Burger for the win!!! This juicy burger is topped with caramelized onions, bell peppers, mushrooms, jalapenos, raw onions, a slice of pepper jack cheese, a scoop of french onion dip, mayo, and is served on a buttery, toasted ciabatta bun! The spicy and sweet flavors fight together to create an explosive flavor profile!
1 lb ground Angus beef, divided into 4 patties
1 1/2 sweet yellow onion, sliced (1/2 is for raw onion topping)
3 tbsp jarred red bell pepper slices (or one fresh red bell pepper, sliced)
6 slices of jarred jalapenos (or 1/2 a raw jalapeno, seeds removed)
3 large mushrooms, sliced
2 tbsp of vegetable oil
4 slices pepper jack cheese
4 ciabatta buns (or large ciabatta loaf sliced into 4 buns)
French Onion Dip
Season the 4 hand shaped patties with the chili powder, salt, and black pepper on both sides. Place the patties on a plate and cover. Refrigerate for at least 30 minutes to an hour to let the seasonings soak in, the longer the better.
Heat the vegetable oil in a large skillet on medium heat, then toss in the onion, red bell pepper, jalapenos, and mushrooms. Cover and cook on medium for approximately 20 minutes until onions are turning a gold color.
Turn the heat up to medium high heat and cook veggies for 5-7 minutes stirring once or twice. A coating should start to form on the pan from the rapidly frying veggies. Carefully add in 1/4 cup of water to the skillet. Stir in the water while scrapping the bottom of the skillet to get those flavors mixed in. Continue cooking until the liquid is cooked out and the veggies are fully caramelized. You are looking for a golden brown color, not just golden. It’s worth the wait trust me!
Set veggies aside in a glass dish.
In the same skillet you used for the veggies, add a tbsp of vegetable oil to coat pan. Heat skillet to medium high heat. Lay patties down in the skillet and sear for 6 minutes. Turn heat down to medium heat and continue cooking for another 6-7 minutes until the edges start to brown. You want to cook it through more than half way before flipping it over. Flip the burgers over and finish cooking for about 6-7 minutes. Check the middle to make sure the burgers are done completely.
Once the meat is cooked take the skillet off the burner, lay a slice of pepper jack and a scoop of veggies on each patty and cover with the lid. This will melt the cheese and keep the veggies heated.
While the burgers cook, butter the ciabatta buns on the inside. In another heated skillet on medium high, lay the buns butter side down and cook until they are crispy and golden.
Spread the bottom of each bun with mayo. Spread the top of each bun with a spoonful of french onion dip. You want the dip to be dripping down on the veggies. Using a spatula transfer the veggie topped meat to the bun and serve!!!