Preheat the oven to 400°F.
Crack the eggs in a large mixing bowl and whisk together with the heavy cream, basil, chives, salt, pepper, and shredded fontina cheese until the egg yolks and herbs are evenly distributed. Set aside.12 large whole eggs
Melt the butter in an oven-safe, 9-10 inch skillet over medium-high heat. A 9 or 10-inch cast iron skillet is a great option, but any oven-safe heavy-bottom skillet works. When the butter is melted and hot, swirl it around to coat the bottom and up the sides of the pan. This helps prevent the eggs from sticking.2 tablespoons unsalted butter1 lb fresh asparagus
Add the chopped asparagus to the melted butter and cook for 3-5 minutes, until it starts to cook and turn a noticeably brighter green color. Add the minced garlic and chopped green onion and continue to cook for another minute, until fragrant.
Turn the heat down to medium and slowly pour the egg mixture evenly over the cooked veggies without stirring. Let it sit and cook over medium heat for 2-3 minutes until the edges and bottom of the eggs just start to set in the pan. While it’s setting slightly, dollop ricotta cheese or crumble goat cheese on top.1/4 cup ricotta cheese or crumbled goat cheese
Carefully transfer the entire skillet to the preheated oven and cook for 20-25 minutes, until the edges are golden brown and the center no longer jiggles when you nudge the pan. Do not overcook.
Carefully remove the skillet from the oven and allow it to cool slightly for 10 minutes. It will puff up while it’s baking and slightly settle while it cools. Run a spatula around the edge of the frittata and top with fresh chives, green onions, basil, and fresh cracked black pepper before cutting. Enjoy it warm or at room temperature.