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Export 9 ingredients for grocery delivery
Step 1
Heat oven to 350ÂşF.
Step 2
Bake butter in 9-inch square baking dish in 2 min. or until melted. Remove dish from oven; brush butter onto bottom and sides of dish.
Step 3
Beat eggs with mixer in large bowl. Add flour, milk and baking powder; mix until blended. Stir in spinach, cheeses and onion. Spoon into prepared dish.
Step 4
Bake 35 min. Let stand 15 min. before cutting into squares to serve.