1. Preheat the oven at 425˚F (220˚C). Spray baking sheet with non-stick spray. Wash sweet potatoes and cut into 3 centimetre thick slices
2. Place 3-4 tablespoons of water on the baking sheet, distribute sweet potato slices evenly and bake for 20-30 minutes or until slices are soft.
3. In food processor, combine toasted sunflower seeds, shredded parmesan cheese, olive oil, garlic cloves and lemon juice, pulse well; then add basil leaves until well mixed and reserve.
4. Remove the baking pan with sweet potato slices from oven, smash each with a fork, top with spinach-sunflower seeds pesto, sprinkle with some more shredded Parmesan cheese and bake for 3-5 minutes of 425˚F(220˚C). until golden and enjoy