Preheat oven to 425F.
Chop potatoes and toss with 2 tablespoon olive oil, ½ teaspoon salt, turmeric, and paprika.
Pour potatoes into a casserole dish (this can be a 9x9 dish or 9x13 style dish).
Bake for about 45 minutes, until golden brown and done.
While potatoes cook, heat the other tablespoon of olive in a large skillet over medium heat. Add the fennel or onion and sauté for 3-5 minutes, until soft.
Add the ground beef and brown.
When the potatoes are done, spread the beef mixture evenly over them then top with the cheese sauce. The sauce can get sticky, just do your best to spread evenly over the mixture. If using regular cheese, sprinkle evenly over the top of the casserole.
Add the dish back to the oven and cook until cheese is melted and bubbly. About 5-10 minutes. Make the sauce during this time.