This makes a total of 4 servings of Any-time Keto Breakfast Casserole. Each serving comes out to be 533 calories, 42.3g fats, 9.4g net carbs, and 26.8g protein.
Gather and prep all of your ingredients. Pre-heat oven to 400F.
Place the onion and sausage into a baking tray and drizzle the olive oil over everything (making sure to grease the tray). Bake for 15 minutes, turning the sausages half way through.
Remove the sausages from the baking tray, then place the cabbage, mushrooms, spinach, tomatoes, and parsley into it. Season with salt and pepper to taste.
Place the sausages back on the top, then return to the oven for 20 minutes.
Remove from the oven to let cool for a few minutes. Garnish with parsley.
Serve immediately, or store in the refrigerator for up to 3 days. Enjoy!