Heat olive oil in a large 12-inch skillet over medium heat. Add ground beef and cook for 6-8 minutes, breaking it apart with a wooden spoon until browned and no pink remains. The beef should develop a nice golden-brown color.

Season the cooked beef with garlic powder, onion powder, salt, and pepper. Stir to distribute seasonings evenly throughout the meat.

Pour in heavy cream and stir to combine with the seasoned beef. Bring mixture to a gentle simmer and cook for 3-5 minutes until the sauce begins to coat the back of a spoon and thickens slightly.

Add fresh spinach to the skillet in batches if needed. Stir continuously as the spinach wilts and reduces in volume, about 1-2 minutes total.

Reduce heat to low and gradually stir in mozzarella and Parmesan cheese until completely melted and incorporated. Adding cheese slowly prevents clumping.

Continue simmering on low heat for 2-3 minutes to allow flavors to meld together. The final consistency should be creamy but not too thick. Taste and adjust seasoning as needed. Garnish with fresh parsley before serving.