Make the homemade taco seasoning by mixing everything in a bowl. This makes slightly more (approximately 2.5 tbsp) than you need. Add 2 tablespoons for this recipe. Option to add the rest if you prefer more heat.
Heat a tablespoon of olive oil in a cast iron skillet (or nonstick frying pan). Fry the onions and ground beef for 4 - 5 minutes, breaking up the meat, until browned.
Add the peppers, taco seasoning, tinned tomatoes and ⅔ cup of water or beef stock. Bring to a boil, then reduce to a simmer and cook for about 7 minutes until thickened, stirring occasionally.
If necessary, transfer the beef mixture into an oven-proof casserole dish. I kept mine in the 26 x 5cm round cast iron pan. Spread over the sour cream and top with shredded cheese.
Bake in the oven for 25 - 30 minutes uncovered or until the cheese is melted.
Allow to cool slightly and top with optional garnishes of choice.
Notes
Makes 6 servings. 5.5g net carbs per serving with garnishes, 4.4g net carbs without garnishes. Storage: Fridge for 3-4 days, freezer for 4-6 months (freeze without the toppings).You can use shop-bought taco seasoning instead of making your own spice mix. Make sure that it does not contain any hidden sugars!