1Saute mushrooms in 3 tablespoons melted butter in a large skillet over medium heat until tender. Add cracker crumbs; stir well. Press the mixture evenly on the bottom and up the sides of a 9-inch pieplate.
2Saute onions in 2 tablespoons butter in the skillet for 1 minute. Sprinkle over the mushroom crust. Sprinkle shredded cheese over the onions. Set aside.
3Combine cottage cheese, eggs, and pepper, stirring well. Pour the cottage cheese mixture over the shredded cheese. Sprinkle with paprika.
4Bake, uncovered, at 350° for 30 to 35 minutes or until set and lightly browned. Let stand 5 minutes before serving.