Heat the oven to 375°F. Lightly grease eight cups of a standard muffin tin.
In a large bowl, whisk the egg with the tomato paste, cumin, chili powder, smoked paprika, salt, and black pepper.
Add the ground beef, black beans, red bell pepper, onion, almond flour, and chopped cilantro. Mix gently with your hands or a fork just until combined. Avoid overmixing so the muffins stay tender.
Divide the mixture evenly among the eight prepared muffin cups. Press it in lightly, leaving the tops slightly rounded.
Bake until the centers are cooked through, about 25 to 30 minutes. Let the muffins rest in the tin for 5 minutes before carefully removing them.