Cook the beef and onion in a skillet over medium heat until the beef is no longer pink, about 5-7 minutes. Drain any fat, then stir in the taco seasoning and follow the package directions. Let it cool a bit.
Flatten half of the biscuits into 4-inch circles and place them on a greased baking sheet. Spoon about 1/4 cup of the meat mixture onto each circle, then sprinkle 1/4 cup cheese on top.
Flatten the remaining biscuits and place them over the filling. Pinch the edges tightly to seal.
Bake at 400°F until the crust is golden brown, about 12-15 minutes.
Notes
Nutrition per serving: Calories: 574, Total Carbs: 55g, Net Carbs: 53g, Fats: 28g, Protein: 23g.