Beef Polenta Pie

Directions

1. 1
   In a large skillet, heat the olive oil over medium-low heat.
2. 2
   Add the mushrooms and onion and cook, stirring, until softened, about 7 minutes.
3. 3
   Add the beef, season with salt and pepper and cook over medium-high heat, stirring, until browned, 4 to 5 minutes.
4. 4
   Stir in the tomatoes, lower the heat and simmer.
5. 5
   In a medium saucepan, bring 3 cups water and 3/4 teaspoon salt to a boil.
6. 6
   Whisk in the polenta until thickened, about 3 minutes.
7. 7
   Whisk in the cream, parmesan and 1/4 teaspoon pepper until smooth; pour into a large casserole dish.
8. 8
   Stir the green beans into the beef mixture and cook over medium heat, stirring, until warmed through, about 2 minutes.
9. 9
   Season with salt and pepper.
10. 10
    Spoon the mixture over the polenta and top with more parmesan.