Preheat your oven to 400°F (200°C). Grease or line an 8×8 inch baking dish to prevent the oatmeal from sticking.

In a large mixing bowl, combine the rolled oats, baking powder, cinnamon, and salt. Stir well to evenly distribute the ingredients.

Add the almond milk, maple syrup, vanilla extract, and peanut butter to the dry mixture. Stir thoroughly until all wet ingredients are fully incorporated into the oats, creating a consistent batter.

Pour the oatmeal batter into the prepared baking dish, spreading it out evenly. Then, dollop the jelly on top of the batter.

Using a knife, gently swirl the jelly into the surface of the batter to create a marbled effect without mixing it completely.

Place the dish in the preheated oven and bake for 35 to 40 minutes, or until the oatmeal is set in the middle and firm to the touch.

Remove the baked oatmeal from the oven and let it cool for 10 minutes. Once slightly cooled, cut it into four portions, serve with your favorite toppings, and enjoy!