Preheat oven to 375 degrees F
Mix together oats, baking powder, salt, cinnamon together.
Add in milk, egg, honey, vanilla, and mix well
Add in chia seeds and berries and mix until just combined
Add to 9x9 baking pan lined with parchment paper, or well oiled
Top with optional nuts before baking
Bake for 45-50 minutes. Allow to cool for 5 minutes and enjoy. Or save in the fridge for up to 5 days.