Preheat oven to 350. Cook bacon in a medium skillet over medium high heat until crisp. Remove bacon and drain on paper towel.
Melt butter in a medium skillet, saute mushrooms and onions until tender.
Crumble bacon into pie shell, sprinkle mushrooms, onions, shrimp evenly over bacon.
Combine eggs, cream, cheese and pepper in a medium bowl and beat well. Pour into pie shell.
Bake until knife inserted into center comes out clean, about 35 to 40 minutes.
