In a cast iron skillet, heat the olive oil over medium-high heat.
Then, reduce the heat to medium and add onions and garlic. Sauté for about 3 minutes. Then, add red bell pepper and cook for more 2-3 minutes. Don't forget to stir frequently.
Add ground beef in the same skillet. Using a wooden spoon, break up the ground beef as it cooks. Stir occasionally, and cook for about 5-7 minutes.
Add butternut squash, Brussels sprouts, tomato sauce and beef broth. Mix all well.
Season with salt, black pepper, Italian season and red chili flakes.
Cover the skillet and cook until the butternut squash are tender. Don’t skip this part. When you close the lid, the steam will help to cook the butternut squash faster. Don’t forget to stir occasionally. If necessary, add a little bit of beef broth to help to cook the butternut squash.
Cook for about 7 minutes. Garnish with fresh parsley.
Place an even amount of ground beef butternut squash into 4 different glass containers and keep it in the fridge for up to 4 days.
