Chop the vegetables into equally small pieces. Combine onion, bell pepper, Worcestershire, breadcrumbs, oats, egg, tomato sauce, salt, pepper, Montreal Steak Seasoning, and garlic.
Fold in the ground beef.
Shape into one large loaf or use muffin tins for individual loaves.
Next, Add ½ of the sauce before baking.
Bake 350 degrees for 45 to 50 minutes for a large loaf. About 25 to 30 minutes if using muffin tins.
The meatloaf is done once it reaches 170 F degrees but takes it out of the oven at 165 degrees. This will keep it from drying out. Meatloaf will finish cooking.
If using muffin tins or cast iron skillet that does not drain the grease away once you remove it from the oven.
Combine all ingredients and cook on the stove just until it starts boiling.
Remove it from the stove and add half of the sauce to the top of the meatloaf before baking it.
Combine all the ingredients for the sauce in a saucepan and bring to a boil.
After you bring the sauce to a boil, cut the heat and simmer for 5 minutes.
Pour half of the sauce over the top of the meatloaf before you bake at 350 degrees for 45 minutes if using a meatloaf pan.
Be sure to add the rest of the sauce to the meatloaf 10 minutes before removing the meatloaf from the oven.