Preheat your oven to 350°F (175°C).

In a large mixing bowl, cream together the softened butter, brown sugar, and granulated sugar until fluffy.

Beat in the eggs one at a time, followed by the vanilla extract.

In another bowl, whisk together the flour, baking soda, and salt.

Gradually add the dry mixture to the wet ingredients, stirring until just combined.

Fold in the oats, chocolate chips, ground flaxseed, and brewer's yeast.

Using a cookie scoop or spoon, drop rounded tablespoons of dough onto a lined baking sheet.

Bake in the preheated oven for about 15 minutes or until the edges are golden.

Let them cool on the baking sheet for a few minutes before transferring to a wire rack.