Your dough needs to chill for 30 minutes to an hour so wait to preheat your oven.
In the bowl of your stand mixer, beat the butter, brown sugar, and granulated sugar until creamy.
1 and ½ cups butter, ¼ cup brown sugar, ¼ cup granulated sugar
Add the remaining ingredients to the mixing bowl: flour, salt, pecans, and vanilla. Beat until combined, being careful not to overbeat.
¼ teaspoon salt, 2 cups all-purpose flour, 1 cup pecans, 2 teaspoons pure vanilla extract
You can measure the cookies using a spring-release scoop or roll them into a log and slice them. I poured the dough onto a large piece of plastic wrap, smushed the dough together, and made a log that was approximately 12 inches long.
To Bake
Preheat the oven to 350℉.
Scoop or slice the cookies and place them on a sheet pan approximately 2 inches apart. If you're using a spring-release scoop, take a flat-bottom glass, dip it in sugar, and press the cookies to 1/4-inch thickness. These cookies don't spread so they'll stay the shape they are unless you flatten them.
They also don't brown much so keep a close eye on them. I baked these at 350℉ for 18 minutes. They only slightly got brown around the edges.
Remove from the oven and transfer to a wire rack to cool. Store in an airtight container, they'll stay fresh 6 to 7 days.