01 -
Turn your oven on to 400°F to warm up. Lightly coat a 9×13-inch baking pan with oil and set it aside for later.
02 -
In a big skillet, warm up some olive oil on medium heat. Toss in the ground beef and break it apart as it cooks. Stir every so often and cook until browned, about 6–8 minutes. Get rid of the extra grease.
03 -
Stir the chopped onion and minced garlic into the skillet with the beef. Let it cook for about 3–4 minutes until they soften. Add the salt, black pepper, ketchup, and mustard. Let everything simmer together for another 2–3 minutes, then take it off the stove.
04 -
Pour the frozen fries across the bottom of your greased dish. Grab the beef mix and spread it evenly over the fries to cover them up.
05 -
Drizzle milk over everything. Scatter cheddar cheese generously on top. Throw in mozzarella cheese if you want an extra gooey layer.
06 -
Slide the dish into your hot oven and let it bake for 25–30 minutes. You'll know it's ready when the cheese is melted and bubbly, and the fries look golden and crispy.
07 -
Sprinkle diced pickles on top, if you're using them, for that classic burger touch. Serve warm and dig in!