In a 8x8 baking dish, stir together oats, baking soda, salt & brown sugar

In a separate bowl (or measuring cup), combine milk, egg, and lemon juice

Pour the liquid mixture into the oat mixture

Add in the berries (or other toppings you're using). You can stir them in, or leave them on top of the mixture

Bake at 350 F for 45 minutes. Lower to 300 F for the last 20 minutes if starting to brown

Remover from oven and allow to cool