Heat the oven to 375°F. Lightly grease the cups of a standard 12-cup muffin tin.
In a large mixing bowl, combine the ground beef, cauliflower, egg, almond flour, onion, parsley, garlic powder, thyme, salt, and black pepper. Mix gently until evenly combined, taking care not to overwork the beef.
Divide the mixture among 8 muffin cups. Press it in gently and shape each portion so the top is slightly rounded.
In a small bowl, stir together the tomato paste, apple cider vinegar, and maple syrup. Spoon a little glaze over each meatloaf muffin.
Bake until the muffins are cooked through and reach an internal temperature of 160°F, about 25 to 30 minutes. Let them rest in the tin for 5 minutes before lifting them out.