Make-Ahead Frittata Squares with Spinach, Tomatoes, and Feta

Make-Ahead Frittata Squares with Spinach, Tomatoes, and Feta

Think of frittata as an Italian cousin to the French omelet, with a few notable differences.

Instead of folding the omelet around the filling as the French do, Italian frittatas mix the eggs and filling together from the start and then bake them together in one dish. It’s a little like an open-faced omelet that can feed the whole family!

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