Preheat your oven to 375°F degrees.
Spray muffin tin with cooking spray thoroughly.
Mix breadcrumbs and milk in large bowl.
Add ground beef to breadcrumb mixture gently.
Crack egg into the meat mixture carefully.
Add diced onion and minced garlic next.
Season with salt and black pepper evenly.
Pour Worcestershire sauce over the mixture completely.
Add half the ketchup to mixture.
Mix all ingredients until just combined together.
Divide mixture evenly among muffin cups.
Top each muffin with remaining ketchup.
Bake for 20-25 minutes until done.
Check internal temperature reaches 160°F exactly.
Let cool for 5 minutes before serving.