Preheat oven to 375 and lightly grease a 9x9 cake pan.
Add the oats, milk, cottage cheese, and brown sugar to a large mixing bowl, and mix thoroughly.
Beat egg in a separate bowl and add to the oats mixture.
Add any berries you're using, along with flax seed, and mix gently.
Add mixture to greased cake pan, and, if you like, sprinkle a little extra sugar on top.
Bake for about 40 minutes, until top is just starting to brown.
Let cool before you remove from the pan. You can serve the bars warm or cool - they're good either way!