In a medium bowl, add breadcrumbs, 1/2 cup parmesan and parsley. Stir to mix through.
Place drumstick in baking dish, drizzle with olive oil.
Press about 1/2 the breadcrumb mixture over the top of the drumsticks.
Place in oven and bake for about 25 minutes.
In a large saucepan over medium high heat, add passata, diced tomatoes, water, garlic, ground basil & ground oregano. Bring to boil, then reduce heat and simmer for about 15 minutes.
After chicken has baked for 25 minutes, remove from oven, pour tomato sauce over the chicken, then top with the remaining breadcrumb mixture.
Sprinkle mozzarella and remaining 1/4 cup parmesan over the top.
Return to oven and bake for a further 20 minutes or until a golden finish has been achieved.
Remove from oven, garnish with baby spinach and serve.