Preheat oven to 375°F.
Whisk egg in a bowl. Add onion replacer, tomato paste, Worcestershire sauce, almond milk, garlic olive oil, thyme, salt, pepper and sage (if using) into small bowl.
Place ground meat in larger bowl and add mixture and breadcrumbs and mix.
Place mixture in meatloaf pan or shape into a loaf on a cookie sheet. Cook for 30 minutes.
Mix together ketchup, mustard and brown sugar.
Remove meatloaf from oven and coat with sauce and return to oven and cook for around 15 minutes or until internal temperature is 160°F.
Let rest 10 minutes before slicing.