1. Heat olive oil in a pan.

2. Add onions and cook until transparent, 2-3 minutes.

3. Add mushrooms and cook until liquids are absorbed, 7-10 minutes.

4. Add peppercorns.

5. Add wine and let evaporate 1-2 minutes.

6. Add beef stock and cook 7-10 minutes

7. Reduce heat and add cream. Stir and cook for 5 minutes.

8. Heat the grill over medium-high heat. Brush grill with olive oil and place burgers. Grill 8-10 minutes on each side or until cooked. Remove from fire.

9. Place hamburger buns on the grill, add cheese slices on the button bun and grill until the cheese melts.

10. Remove buns from fire, top with burgers and mushroom sauce on top.

11. Serve burgers with twister potatoes.