Herby Greens and Goat Cheese Frittata

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8 eggs

2 teaspoons minced fresh rosemary 

Pinch red pepper flakes 

Kosher salt and freshly ground black pepper

4 tablespoons unsalted butter 

1 small onion, finely chopped 

1/2 cup cherry or grape tomatoes 

2 cups finely chopped leafy greens (Swiss chard, collards, mustard or kale) 

4 ounces fresh goat cheese, at room temperature