Summer Squash Casserole
["3 c. yellow squash, cut in cubes", "1/4 c. sour cream", "1 Tbsp. melted butter", "1 Tbsp. shredded Cheddar cheese", "1/2 tsp. salt", "1/8 tsp. paprika", "1 egg yolk, beaten", "2 Tbsp. softened butter", "1/2 c. Parmesan cheese", "1/2 c. dry bread crumbs"]
["Simmer squash until just tender; drain.", "Combine sour cream, melted butter, cheese, salt and paprika.", "Stir mixture over low heat until cheese is melted.", "Stir in egg yolk.", "Next, stir squash into mixture."]
["yellow squash", "sour cream", "butter", "Cheddar cheese", "salt", "paprika", "egg yolk", "butter", "Parmesan cheese", "bread crumbs"]