In a large mixing bowl, combine the ground beef, egg, almond flour, finely diced onion, minced garlic, sea salt, black pepper, and dried oregano.
Gently mix the ingredients by hand until just incorporated, taking care not to overwork the meat to maintain a tender consistency.
Roll the mixture into 8 to 10 uniform meatballs, roughly the size of a golf ball.
Heat the olive oil in a large non-stick skillet over medium-high heat.
Place the meatballs in the skillet and sear for 2-3 minutes per side until a golden-brown crust forms on all sides.
Pour the tomato puree over the meatballs and sprinkle in the red pepper flakes for a zesty flavor profile.
Reduce the heat to low, cover the skillet with a lid, and simmer for 10-12 minutes until the meatballs are cooked through and the sauce has slightly thickened.
Garnish with freshly chopped parsley and serve immediately.