Easy Zucchini and Tomato Frittata (Ready in 25 Minutes)

Ingredients

• 8 large eggs
• 1/4 cup (60 ml) half-and-half or whole milk
• 1/3 cup (30 g) finely grated Parmesan cheese, plus more for serving
• 1/2 teaspoon kosher salt
• 1/4 teaspoon black pepper
• 1 tablespoon olive oil
• 1/2 small yellow onion, thinly sliced
• 1 medium zucchini, thinly sliced, about 1 1/2 cups (225 g)
• 1 clove garlic, minced
• 1 cup (150 g) cherry tomatoes, halved
• 2 tablespoons chopped fresh basil