Preheat your oven to 350 degrees Fahrenheit. Line two baking sheets with parchment paper to prevent sticking. This will help achieve perfectly baked cookies that won’t stick to the pan.
In a medium bowl, mix together the flour, oats, baking powder, baking soda, salt, and cinnamon. This dry mixture lays the foundation for your cookie dough.
In a large mixing bowl, use an electric mixer to beat the softened butter, granulated sugar, and brown sugar together until the mixture is light and creamy. This step is crucial as it incorporates air, which helps your cookies rise.
Next, beat in the eggs and vanilla until well combined. You want everything to be smooth and evenly mixed.
With the mixer on low speed, gradually add the dry flour mixture to the wet ingredients. Mix just until there’s no visible dry flour left. Overmixing can lead to tough cookies, so be gentle!
Now, fold in the white chocolate chips and chopped pecans with a spatula or wooden spoon. This step adds delicious flavor and texture to each cookie.
Using a medium scoop, drop cookie dough onto the prepared baking sheets, spacing them a few inches apart to allow for spreading.
Bake in the preheated oven for 10 to 12 minutes, or until the edges are golden brown. The centers may look a bit soft, but they'll firm up while cooling.
Once baked, let the cookies cool on the baking sheets for a few minutes before transferring them to wire racks to cool completely. This cooling step helps them set perfectly.