Brush crust with melted butter. Sprinkle bacon inside crust. Place zucchini, eggs and cream in a blender; puree until smooth. Pour zucchini mixture into a bowl and stir in marjoram, onion salt, pepper, and cayenne. Fold in cheese and pour mixture into pie crust.
Bake in preheated oven for 15 minutes. Reduce heat to 300 degrees F (150 degrees C) and bake for an additional 45 minutes, or until set.