• Preheat oven to 400°F.
• In a mixing bowl, combine ground beef, salt, pepper, onion powder, and mustard. Mix until just combined—don’t overwork the meat.
• Press the beef mixture flat into a small rimmed baking sheet (lined with parchment for easier cleanup).
• Bake on the top rack for about 15–18 minutes, or until fully cooked.
• Let the meat cool slightly, then use a wide-mouth jar or biscuit cutter to cut into mini burger patties.
• Layer patties onto slider buns and top each with a slice of cheddar cheese.
• Wrap each burger in parchment paper and place in a freezer-safe container or zip-top bag.
• Freeze until ready to use.

Reheating Instructions:

• Microwave: Wrap in a damp paper towel and microwave for 1–1.5 minutes from frozen.
• Oven/Toaster Oven: Bake at 350°F for 10–12 minutes, wrapped in foil.
• Air Fryer: Air fry at 350°F for 5–6 minutes.