Spinach Supreme

2 10 ounce frozen chopped spinach
3 slices bacon, cooked and crumbled
1 6 ounce sliced mushrooms, drained
1/4 teaspoon marjoram dry, crushed
1 8 ounce carton sour cream
1 cup grated sharp cheese

Cook spinach by package directions. Combine all ingredients except cheese. Put into greased 1-1/2 qt. casserole. Bake at 325* for 20-25 minutes. Sprinkle with cheese and return to the oven for 5 minutes.