Prepare the Tater Tot Cups:

1. Preheat oven to 425°F (220°C). Grease a mini muffin pan with nonstick spray.
2. Place 2 frozen tater tots in each muffin cup. Bake for 15 minutes.

Make the Sloppy Joe Filling:

3. In a large skillet, cook ground beef over medium-high heat until no longer pink. Drain excess grease.
4. Stir in tomato sauce, Dijon mustard, Worcestershire sauce, apple cider vinegar, brown sugar, garlic powder, onion powder, and chili powder. Season with salt and pepper to taste.
5. Bring to a boil, then reduce heat and simmer for 5 minutes, until most of the liquid has been absorbed.
6. In a small bowl, whisk together cornstarch and water to create a slurry. Stir into the skillet and cook until the sauce thickens. Remove from heat.

Assemble & Bake:

7. Remove the parbaked tater tots from the oven. Using a tart tamper or spoon, press them down into cup shapes.
8. Fill each tater tot cup with sloppy Joe mixture and sprinkle with cheddar cheese.
9. Return to the oven and bake for 5-7 minutes, or until the cheese is melted and bubbly.