1. Preheat your oven to 350°F.

2. Cut the sweet potatoes into cubes and place them in a baking tray.

3. Melt the butter and pour it over the sweet potatoes. Sprinkle with salt and pepper.

4. Bake for about 25-30 minutes, or until the sweet potatoes are tender.

5. Meanwhile, heat some oil in a large skillet over medium-high heat.

6. Add the ground beef and cook, breaking it up as it cooks, until it's browned.

7. Add salt, pepper and any herbs you choose (optional).

8. Reduce the heat to medium-low and add the tomatoes.

9. Simmer for 10 minutes, stirring occasionally.

10. Add the cooked sweet potatoes to the skillet with the beef and tomato mixture.

11. Stir to combine everything together and cook for an additional 5 minutes.

12. Top with slices of avocado and grated cheddar cheese. Serve hot.