Adjust oven rack to middle position and heat oven to 350 °F. Line baking sheet with parchment paper or silicone baking mat. In small bowl, mix together white whole wheat flour, baking spices, baking powder, baking soda, and salt. Set aside.
Using stand mixer fitted with paddle, beat butter, avocado oil, and sugars together at medium-low speed until just combined, about 20 seconds. Increase speed to medium and continue to beat until light and fluffy, scraping down bowl as needed, about 1 minute. Add egg and vanilla; beat on medium-low until fully incorporated, about 30 seconds, scraping down bowl as needed.
Reduce speed to low and add flour mixture. Mix until just incorporated and smooth, about 10 seconds. With mixer still running, gradually add oats and pecans and mix until well incorporated, about 30 seconds. Gently stir dough to ensure no flour pockets remain and ingredients are evenly distributed.
Working with 2 tablespoons of dough at a time, roll into balls and space 2 1/2 inches apart on prepared sheets. Gently press each ball to 3/4 inches thick.
Bake until cookies are lightly browned, edges are crisp, and centers just yield to pressure when gently pressed, about 15 to 20 minutes, rotating sheet halfway through. Let cookies cool for 5 minutes, then remove to wire rack. Cool completely before serving.