3Campari tomatoes, sliced; I cut each into 4 slices (See Notes below)
2ouncesfeta cheese, crumbled
salt, to taste
black pepper, to taste
chopped fresh parsley, for garnish (optional)
Special Equipment
10-inch oven-safe non-stick skillet (or a well-seasoned 10-inch cast iron skillet)
Instructions
Preheat the oven to 350°F.
Heat the olive oil in a 10-inch oven-safe nonstick or cast iron skillet over medium heat. Add the kale and onions; sauté, stirring occasionally, until the onions have softened, about 4 minutes. Season lightly with salt and pepper.
Add the garlic; sauté, stirring frequently, for another minute or two.
Add the butter; stir until melted, then spread out the kale mixture evenly in the skillet.
In a large bowl, whisk together the eggs, heavy cream and some salt (I use about ½ teaspoon) until well-combined.
Pour the egg mixture into the skillet; cook until the edges are just starting to set, about 3 to 4 minutes.
Top with the sliced tomatoes and feta cheese.
Put the skillet in the oven; bake for 25 to 30 minutes or until the eggs are set throughout.If you give the skillet a gentle shake, there should be no jiggle in the center (or anywhere). You can also test it by sticking a knife into the frittata. If it comes out clean with no wet eggs, it's done.
Allow the frittata to rest in the pan for 5 to 10 minutes before slicing and serving.
Sprinkle with fresh chopped parsley, if desired.
Recipe Notes
I use a 10-inch skillet for a taller frittata, but you could also use an 11 or 12-inch skillet. The frittata will just be thinner (and it will probably cook a little quicker).
I like the Campari tomatoes because they are small and sweet, but you could use any kind or size of tomatoes you've got (you could even use sun-dried tomatoes). You need enough to evenly cover the top of the frittata.
Frozen spinach could be used instead of kale. I like the cut leaf spinach, but chopped spinach works too.
I use frozen kale because it cuts down on the prep time and it's less expensive. If you'd rather use fresh kale, you'll need approximately 15 ounces to 1 pound to get the 3 cups needed for this recipe. Remove the large, tough stems, wash it well, chop it up, and sauté it with the onions in olive oil until both have softened.
Store leftovers, once cooled, in an airtight container in the refrigerator for up to 3 to 4 days. See the post for tips on reheating.
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