Preheat the oven to 350 degrees F and line a 9” x 9” baking pan with parchment paper.

Mash the bananas in a mixing bowl until creamy. You can leave some chunks if you like them!

Whisk in the almond milk, eggs, and vanilla extract until everything is well-combined.

Pour in the rolled oats, cinnamon, nutmeg, baking powder, and sea salt and stir until well-combined. The mixture will appear fairly watery. This is normal! Note: If you’re adding chopped walnuts or chocolate chips, do so now.

Pour the oatmeal mixture into the prepared pan and smooth into an even layer.

Bake on the center rack of the oven for 40 to 50 minutes, or until the baked oatmeal has set up. Allow the baked oatmeal to cool for at least 30 minutes before slicing and serving. Note: You can serve it sooner without allowing it to cool, but it will fall apart rather than stay held together in a square oat bar.