Pre-heat oven to 350 degrees and line two baking sheets with silicone baking mats.

In a large bowl, whisk together dry ingredients: oats through salt.

In a separate medium bowl, whisk together wet ingredients: eggs through vanilla.

Slowly stir the wet ingredients into the dry and stir until evenly incorporated being sure to scrape down the sides of the bowl with a rubber spatula.

Fold in the diced apples and chopped walnuts.

Use a large cookie scoop to scoop out batter on prepared baking sheets leaving 2 inches in between each cookie. Gently press batter with fingers to flatten slightly.

Bake cookies for 10-12 minutes or until centers are firm to touch.

Cool in pan on wire rack.