Step 1

Preheat oven to 350 degrees F (175 degrees C).

Step 2

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 jalapeno and zucchini; season with pinch of salt. Cook until zucchini start 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.

Step 3

Crack 12 large eggs into a bowl. Add cayenne, salt, and pepper. Whisk for at least 30 seconds. Pour eggs into over vegetables in skillet over medium heat. Add 3 ounces of crumbled goat cheese; stir lightly until evenly distributed. Top with remaining cheese. Remove from heat.

Step 4

Bake in preheated oven until eggs are set, 12 to 15 minutes. When nearly set, turn on broiler. Broil frittata until top browns, 1 to 2 minutes. Cool slightly; serve warm.