Preheat oven to 375°F and prepare a 12-cup muffin tin with cooking spray or parchment strips.
Dice onion & mince garlic, whisk glaze ingredients together, and set aside.
Mix all meatloaf ingredients in a large bowl using your hands until just combined (don’t overmix).
Fill muffin tin ¾ full with mixture, press gently in center, and top each with a teaspoon of glaze.
Bake 20–25 minutes or until internal temp reaches 160°F; drain grease halfway if needed.
Rest 5 minutes, run knife around edges, and remove cups. Serve warm with remaining glaze.