Prepare the Dough : Preheat your oven to 350°F (175°C). Line two baking sheets with parchment paper. In a large mixing bowl, combine melted butter, light brown sugar, and granulated sugar. Mix until smooth and creamy. Add eggs one at a time, mixing well after each addition. Stir in vanilla extract.

Add Dry Ingredients : In a separate bowl, whisk together all-purpose flour, oats, baking soda, salt, and cinnamon. Gradually add the dry ingredients to the wet mixture, stirring until combined.

Mix in Chocolate Chips : Fold in the white chocolate chips and semisweet chocolate chips evenly throughout the dough.

Shape and Bake : Scoop tablespoons of dough onto the prepared baking sheets, spacing them about 2 inches apart. Bake for 10–12 minutes, or until the edges are golden brown but the centers are still soft.

Cool and Serve : Let the cookies cool on the baking sheet for 5 minutes, then transfer them to a wire rack to cool completely. Enjoy warm or store in an airtight container for up to a week.