Preheat the oven to 350 degrees F (175 degrees C).
Heat oil in heavy 10-inch skillet over medium heat. Cook leek with a pinch of salt, stirring occasionally, until leeks soften and start to turn translucent, 5 to 6 minutes. Add jalapeño and zucchini; season with pinch of salt. Cook until zucchini starts to get tender and pale green, about 5 minutes. Add asparagus and cook until bright green, about 1 minute. Add spinach and another pinch of salt, cooking until wilted, 1 minute. Stir in cooked potatoes and heat through, about 5 minutes.
Crack eggs into a bowl. Add cayenne, salt, and pepper. Whisk for at least 30 seconds. Pour eggs into the skillet with vegetables over medium heat. Add 3 ounces crumbled goat cheese; stir lightly until evenly distributed. Top with remaining cheese. Remove from heat.
Bake in the preheated oven until eggs are set, 12 to 15 minutes. When nearly set, turn on the broiler. Broil frittata until top browns, 1 to 2 minutes. Cool slightly; serve warm.
Nutritional Facts
Per 6 servings
Calories: 315
Carbohydrate: 19g
Fat: 19g
Fiber: 3g
Protein: 18g
Sugar: 4g
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