Pre-heat oven to 350F. Line the baking dish with parchment paper.
Make the cardamom cream by whisking together the mascarpone, ground cardamom, icing sugar and milk. Set aside
Cut each pear in half lengthwise and lay pear halves skin-side down in the baking dish. If needed, slice a small piece off skin-side so the pears lay flat in the baking dish.
With small spoon (or melon baller), scoop out the cores / seeds in the middle of each pear half.
Mix together the oats, walnuts, cinnamon, sugar and melted butter.
Divide the oat mixture between four pear halves, spooning into the scooped out center of each pear. Drizzle each pear half with 1 tbsp maple syrup .
Bake for 35-40 minutes, until the oat mixture is golden brown and the pears are soft, tender but still hold their shape.
Let sit for about 5 minutes and then serve each with a dollop of the cardamon cream.