Preheat oven to 375°F. Spread frozen crinkle fries on a foil-lined, sprayed baking sheet. Season with salt and pepper. Bake 20–25 minutes, flipping halfway, until golden and crisp.
Sauté ground beef and chopped onions in a skillet over medium-high heat until browned. Drain fat.
Lower heat. Stir in mushroom soup, cheddar soup, half and half, and Worcestershire. Cook 2 minutes until smooth, then remove from heat.
Grease a 9x13 dish. Add beef mixture, then 1 cup shredded cheddar on top.
Layer baked fries over the cheese. Sprinkle with remaining 2 cups cheddar.
Bake uncovered for 18–20 minutes until cheese is bubbly.
Let rest 5 minutes. Serve hot and gooey.