Recently, I wanted to make a green bean casserole, but not wanting to bake it for the hour the recipe calls for. I made the casserole up like I'd normally do, but nuked it in the microwave till good & bubbly, while at the same time, I had my oven preheating.
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Melt butter in small saucepan over low heat. Stir in flour; cook 1 to 2 minutes, stirring constantly. Using a wire whisk, stir in milk; bring to a boil.
I brown some of the onions in the toaster oven for a crispy garnish on the top; or place the crispy onions in a bowl for each person to sprinkle on their own serving.