Preheat oven to 350ºF and cover 2 cookie sheets with parchment paper.
Mix oats, sugar, baking powder, pecans and salt together in a large bowl until well incorporated.
Add butter, egg and vanilla to oat mixture; mix well.
Drop teaspoonfuls of batter onto prepared cookie sheets and flatten each out, leaving at least 2-inches between each cookie.
Bake cookies until edges turn golden, about 8 to 12 minutes. Let cookies stand on cookie sheets for 2 minutes before removing to a cooling rack. Yields 2 cookies per serving.
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