Preheat oven at 350°F (180°C).

Crack eggs onto bowl, add vanilla and whisk.

Once, eggs have been beaten for about 5-10 minutes go ahead and add sugar, oil, and plain yogurt/greek yogurt/buttermilk/sour cream, and mix until they are combined.

On a separate bowl add the dry ingredients, flour, oats, oat flour, baking powder, baking soda, and salt.

Gradually add the dry ingredients onto your wet ingredients bowl as you mix.

Grate the peel off your lemons and add this plus the the lemon juice onto your bowl once all the ingredients are well combined and mix one final time. 

Next grease your 8x8 or 8x4 pan or line it with parchment paper.

Pour mix onto pan (at this moment once in the pan you can add blueberries, rasperries or any topping you'd like and use a spatula to integrate them well onto the mix) and its ready to cook for 40 minutes to 1 hour (depending on if you cook in your small oven or oven).

Once, it’s cooked let it rest for 10 minutes and then take out of pan onto a cooling rack.