In this recipe, ground beef patties are seasoned simply with salt and pepper, grilled to medium-rare and served with a spicy twist of jalapeño cream cheese, strips of bacon and crispy onions piled on a brioche bun.
Preheat outdoor grill to high (about 450ºF/ 230ºC).
In a small bowl stir together the cream cheese and jalapeños until combined. Cover and refrigerate until ready to use.
Arrange bacon in a single layer on an aluminum foil lined baking sheet and bake until crispy and golden brown, about 16 minutes. Remove to a paper towel-lined plate to drain and set aside.
In a medium cast-iron pan over medium heat, heat enough avocado oil to fill about a half inch up the pan. Heat the oil to 350°F. Toss the sliced onions in the flour working a handful of onions at a time, add to the hot oil and fry until golden brown all over, about 5 minutes. Remove to a paper towel-lined plate to drain and repeat with the remaining onions.
Divide the ground beef into 4 equal portions (about 6 ounces each) and flatten into patties. Lay out on a parchment paper-lined baking sheet and season on both sides with salt and pepper.
Place the burger patties on the grill in a single layer. Cook until grill marks appear, about 2 minutes. Flip and cook until grill marks appear on the other side, about an additional 2 to 3 minutes for medium-rare.
During the last minute of cooking add the buns, cut side down to toast them.
To assemble the burgers, place a patty on the bottom half of the bun, top with a spoonful of the jalapeño cream cheese mixture followed by 2 strips of bacon and a handful of crispy onions. Close the burgers and serve.