Preheat oven to 350F.

Combine butter, sugar, and brown sugar in a mixer.

Add flaxseed to water and allow to sit for 3-5 minutes.

Add vanilla extract, egg, and flaxseed to batter.

Whisk together flour, baking soda, salt, and brewer's yeast.

Add dry ingredients to butter and sugar mixture.

Fold in oats and raisins, then spoon on to cookie sheet.

Bake for 12 minutes.