Preheat your oven to 350°F. Line a rimmed sheet pan with foil.
In a large bowl, whisk the egg, salt, pepper, garlic powder, onion powder, and thyme.
Add the ground beef, almond flour, and Parmesan. Gently mix, just until uniform.
Shape the mixture into a rectangular loaf by packing it into a plastic wrap-lined small loaf pan (8 X 4 inches).
Transfer it to the prepared baking sheet.
Brush the meatloaf with ketchup.
Bake the meatloaf until its center registers 160°F, 50-60 minutes.
Rest the meatloaf for 15 minutes before slicing and serving.
