In a frying pan over medium heat, melt 3 tablespoons of the butter.
Add mushrooms and cook until soft; stir in crushed crackers.
Turn mixture into a well-greased 9-inch pie pan and press evenly into pan bottom and up the sides.
In same frying pan over medium heat, melt remaining 2 tablespoons butter.
Add onions and cook until soft.
Spread onions over mushroom crust; sprinkle evenly with shredded cheese.
In a blender, whirl cottage cheese, eggs, and cayenne until smooth.
Pour into crust and sprinkle with paprika.
Bake in a 350° oven for 20 to 25 minutes or until a knife inserted in center comes out clean.
Let stand for 10 minutes.