Indulge in this hash brown beef casserole, loaded with savory ground beef, melted cheddar cheese, and a tangy mayonnaise sauce. Topped with sesame seeds for added crunch, this comforting dish is sure to be a crowd-pleaser.
Preheat the oven to 400°F (200°C).
Place hash brown patties in a single layer at the bottom of a 9x13 inch baking dish. Bake until golden and crisp on the bottom, about 25 minutes.
While the hash browns bake, grate or finely mince 2 tablespoons of onion and set aside with any accumulated juices. Cut the remaining onion into a small dice and set aside.
In a bowl, combine the grated onion with mayonnaise, 1/2 tsp salt, sweet pickle relish, white vinegar, sugar, mustard, paprika, and onion powder. Mix well and set aside.
In a large skillet, heat oil over medium-high heat. Add beef and cook undisturbed for 3 minutes. Crumble the meat with the back of a spoon and stir occasionally until browned and mostly cooked through, about 5 minutes.
Season with remaining salt and pepper, then add Worcestershire and chopped onions. Cook for 1 minute.
Remove from heat and mix in 2/3 cup of the sauce mixture and 1 1/3 cup cheese.
Flip hashbrown patties over so the crispy side faces up. Pour the meat mixture over the hash browns and top with remaining shredded cheese.
Sprinkle sesame seeds on top and bake until bubbly and cheese is melted, 10 to 12 minutes. Remove from oven and let stand for 5 minutes.
Top with shredded lettuce, drizzle remaining sauce, and add pickles. Serve immediately.
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