Preheat your oven to 375 degrees Fahrenheit and line a small baking dish with parchment paper.
Finely chop the mushrooms and mince the onion and garlic until they are very small pieces.
In a large mixing bowl, combine the ground beef, chopped mushrooms, onion, garlic, egg, almond flour, dried thyme, sea salt, and black pepper.
Mix the ingredients by hand until just combined, being careful not to overwork the meat which can make it tough.
Form the mixture into a compact loaf shape and place it in the prepared baking dish.
Spread the tomato paste evenly over the top of the loaf to create a savory glaze.
Bake for 35 to 40 minutes or until the internal temperature reaches 160 degrees Fahrenheit.
While the meatloaf rests for 5 minutes, steam the broccoli florets until they are tender-crisp and vibrant green.
Slice the meatloaf and serve alongside the steamed broccoli for a complete, clean meal.