Sauté spinach and onions in olive oil until onions and spinach are sweated/wilted. Place in bottom of a casserole.
Cube tomatoes, prosciutto (ham) and add to the casserole in layers.
Mix eggs, sour cream and spices to form a custard. Pour over top of casserole and spread evenly. Use a spoon handle to help the custard penetrate the layers but avoid stirring.
Grate cheese and sprinkle on top, or spread slices evenly.
Bake at 350 °F (175 °C) for 30-45 minutes or until a knife/toothpick inserted into the custard pulls out clean.
Let cool before slicing.
Nutrition summary
There are 206 calories in 1 serving of Spinach Casserole.
