Preheat oven to 375 degrees. Line a baking sheet with parchment paper.
Brown the two sticks of butter and set aside.
Toasted Pecans
Melt 1-1/2 Tablespoons butter in a saucepan.
Next, add the 1-1/2 cups of chopped pecans to the saucepan and toast the pecans for about five minutes. Set aside.
Pecan Cookies
Add the flour, cornstarch, salt, baking soda, and cinnamon to a medium-sized bowl and whisk. Set aside.
Next, pour the browned butter into a large bowl and add the brown and white sugars. Mix well.
Add the vanilla extract and eggs and mix.
Now, add the flour mixture and mix well.
Finally, add the toasted pecans to the cookie dough and fold in.
Refrigerate the cookie dough for at least one hour.
Scoop the cookie dough onto the cookie sheet about two inches apart. Each cookie should be about 1-1/2 to 2-inches around.
Place a pecan half on each cookie.
Bake for about nine minutes or until the edges are golden brown. The center should still be a little wiggly.