Chop the onion and bell peppers to size of your liking. Then, season with salt/pepper and sautee in olive oil on medium-high heat stirring occasionally. Once the beef is browned, reduce the heat of the vegetables to low and let cook.
Put your ground beef in a pot over medium-high heat and start to brown it. Season with salt, pepper, and spices.
Once the beef is browned, add the spinach to the pot. Let stream for 2-3 minutes, then mix in well.
Add low carb tomato sauce to pot, stir well, then reduce heat to medium-low and cook for 10 minutes.
Add in the optional parmesan cheese and then stir together, then add the vegetables in and stir again. Let cook for a few more minutes and serve with toppings of your choice when ready.