Kumara baked with silverbeet and mozzarella

Ingredients

• 4 large kumara (about 350g each)
• 1 tablespoon extra virgin olive oil
• 1 small red onion, chopped
• 1 clove garlic, finely chopped
• 1 teaspoon chopped thyme leaves
• 1/4 teaspoon chilli flakes
• 1/2 bunch silverbeet, stems removed, sliced
• 125 gram smoked or plain mozzarella, cut into pea-sized cubes
• 1/4 cup water
• 1/4 cup grated parmesan