Gnocchi with Tomato Sauce and Mozzarella

Ingredients (8)

• + 1 ½ tablespoons extra-virgin olive oil add to pantry
• + ½ onion, finely chopped add to pantry
• ✓ 1 ½ (14.5 ounce) cans passata (crushed tomatoes)
• + salt to taste add to pantry
• + 1 (18 ounce) package potato gnocchi add to pantry
• + 2 tablespoons grated Parmesan cheese add to pantry
• + 1 (4 ounce) ball fresh mozzarella, cubed add to pantry
• + 4 fresh basil leaves add to pantry