Preheat oven to 350 degrees. Line a large baking sheet with parchment paper.
In a medium mixing bowl, whisk together oats, flour, baking soda, salt and cinnamon. In another medium mixing bowl, whisk together oil and brown sugar, until fluffy. Whisk in eggs, until incorporated, then whisk in vanilla yogurt and vanilla extract. Pour dry ingredients into wet ingredients and whisk until just combined. Fold in desired mix-ins. Scoop dough using a 2-inch cookie scoop, about 1-inch apart on the baking sheet. Bake 9-12 minutes. Allow to slightly cool.