1.Preheat Oven To 350 Degrees F (175 Degrees C). 2.Place Eggs In A Saucepan And Cover With Cold Water. Bring Water To A Boil. Cover Pan, Remove From Heat, And Let Eggs Stand In The Hot Water For 10 To 12 Minutes. Remove From Water; Peel And Chop. 3.Combine The Chopped Eggs, Spinach, Onion Powder, Tuna, Cream Of Mushroom Soup, And Sour Cream In A 9X13 Inch Baking Dish. Mix Well. Scatter Bread Pieces Over Tuna Mix; Drizzle With Melted Butter. 4.Bake In Preheated Oven Until Bread Is Toasted And Casserole Is Hot, About 30 To 35 Minutes.