These incredibly juicy stovetop Butter Burgers have a perfectly crisp outer crust, making them the most flavorful burger you will ever make at home. This classic Midwestern burger is served with melted cheese, cooked onions, and pickles.
Grate 6 tablespoons very cold butter, spread shreds evenly on a parchment lined tray or plate, and freeze until very cold again.
With gloved or very clean hands, gently mix frozen shredded butter into ground beef and make 4 equal-sized patties, pressing until they are about 6 inches diameter. Cover and set aside or chill until ready to cook.
Heat a 12-inch non-stick skillet over medium-high heat. Add 2 tablespoons butter plus the 1 tablespoon avocado oil, and onions. Cook, stirring frequently until onions soften, about 5 minutes. Reduce heat to medium and cook until onions are just turning golden in parts, 7 to 8 more minutes. Remove to a bowl and set aside.
Meanwhile butter buns with remaining 4 tablespoons butter and then toast in the skillet over medium heat, about 1 minute. Remove and set aside.
Heat the skillet over medium heat, then add prepared beef patties. Cook patties flipping halfway through, and cook just until browned and cooked, about 5 minutes total. Butter will melt and the burgers will sizzle in the butter getting crispy edges.
Add slices of cheese on burgers just before removing from skillet. Remove burgers to a wire rack set over a tray.
To build burgers, spread mayonnaise on bottom buns, top with cheese-topped butter burgers, add onions, pickles, and top buns. Serve immediately.