Venison Burger

Ingredients
- 1 pound coarsely ground venison,
- 1 tablespoon chopped garlic,
- 2 tablespoons chopped parsley,
- 1/4 cup finely chopped green bell pepper,
- 1/2 teaspoon seasoning salt,
- 1/8 teaspoon cayenne pepper,
- 1 teaspoon Worcestershire sauce,
- 2 teaspoons prepared horseradish,
- 1/2 teaspoon hot pepper sauce,
- 1 large onion, sliced thin.
- 1/4 pound mushrooms, sliced thin.
- 1/4 stick butter,
- 1/4 pound thinly sliced cheese, gouda or gorgonzola.
- 3 large hamburger buns.