Preheat Oven: Preheat your oven to 350°F (175°C). Grease an 8x8-inch baking dish or similar-sized oven-safe dish.

Mix Dry Ingredients: In a large bowl, combine the rolled oats, baking powder, cinnamon, nutmeg, and salt. Stir until well mixed.

Mix Wet Ingredients: In another bowl, whisk together the pumpkin puree, maple syrup (or honey), milk, eggs, and vanilla extract until smooth.

Combine Mixtures: Pour the wet ingredients into the dry ingredients, mixing until just combined. Gently fold in the chocolate chips.

Transfer to Baking Dish: Pour the mixture into the prepared baking dish, spreading it evenly.

Bake: Bake in the preheated oven for 30-35 minutes, or until the top is golden and a toothpick inserted into the center comes out clean.

Cool and Serve: Allow the baked oatmeal to cool for a few minutes before slicing. It can be served warm or at room temperature.