0.5 cup pecorino romano cheese fresh finely grated
0.5 teaspoon salt divided
Equipment
frying pan
oven
whisk
spatula
cutting board
Directions
Preheat oven to 35
Combine first 3 ingredients; add 1/4 teaspoon salt, stirring with a whisk.
Heat a 10-inch ovenproof skillet over medium-high heat.
Add 2 teaspoons oil; swirl to coat.
Add mushrooms and remaining 1/4 teaspoon salt; saut 6 minutes or until mushrooms brown and most of liquid evaporates. Stir in onions; saut 2 minutes. Reduce heat to medium.
Add egg mixture and basil to pan, stirring gently to evenly distribute vegetable mixture; cook 5 minutes or until eggs are partially set.
Place pan in oven.
Bake at 350 for 7 minutes or until eggs are cooked through and top is lightly browned.
Remove pan from oven; let stand 5 minutes. Run a spatula around edge and under frittata to loosen from pan; slide frittata onto a plate or cutting board.
Combine the remaining 1 teaspoon oil, arugula, and lemon juice.
Cut the frittata into 6 wedges; top with arugula mixture.