01 - Preheat the oven to 400°F. Line a baking tray with parchment paper.
02 - Brush sweet potato halves with 2 tbsp olive oil and season with salt and pepper. Place cut-side down on the tray.
03 - Roast for 30 minutes, until tender and lightly caramelized.
04 - While the sweet potatoes roast, prepare the pesto: In a food processor, blend basil, toasted pine nuts, garlic, Parmesan, salt, and pepper. With the machine running, slowly drizzle in the olive oil until smooth. Adjust seasoning as needed.
05 - Remove sweet potatoes from the oven and let cool slightly. Flip them cut-side up.
06 - Top each sweet potato half with cherry tomatoes and mozzarella. Return to the oven for 5 minutes, just until the cheese softens.
07 - Remove from oven, drizzle generously with fresh pesto, and garnish with basil leaves. Serve warm or at room temperature.