Step 1

Place a rack in middle of oven; preheat to 375°. Butter an 8x8" ovenproof baking dish. Whisk egg, orange zest, orange juice, milk, maple syrup, melted butter, vanilla, salt, cinnamon, and ginger in a large bowl to combine. Add old-fashioned oats, steel-cut oats, apple, carrot, raisins, baking powder, and ½ cup pecans and stir again to combine. Scrape into prepared baking dish and sprinkle more pecans on top.

Step 2

Bake oatmeal until top is golden brown and has puffed up a bit, about 40 minutes. Let sit 5 minutes.

Step 3

Serve warm with a drizzle of cream on top.Do ahead: Oatmeal can be baked 5 days ahead. Cover and chill. Reheat with a splash of milk before serving.