Mushroom and Spinach Frittata | RICARDO

Ingredients

• 6 eggs
• 1/4 cup (60 ml) milk
• 1 cup (250 ml) grated cheddar cheese
• 1 onion, thinly sliced
• 4 oz (115 g) white button mushrooms, sliced
• 3 tablespoons (45 ml) butter
• 2 cups (500 ml) baby spinach
• Salt and pepper