Thinly slice squash. Cook in 3 quart pan with splash of water for 5 minutes. Drain well. Combine sour cream, egg yolks, and flour. Add egg whites. Layer in baking dish - half of squash, egg mix, cheese and all bacon. Repeat layers of squash, egg, and cheese. Sprinkle crumb mix over top; baked uncovered for 20 minutes at 350 degrees.