In a medium saucepan over medium-low heat, melt the butter. Stir constantly with a spatula, scraping the bottom to prevent burning. After 6–7 minutes, the butter will foam, then turn a deep golden brown and develop a rich, nutty aroma. Remove from heat.
1 cup unsalted butter
Immediately stir in the brown sugar and granulated sugar until smooth and fully incorporated. Transfer the mixture to a bowl and refrigerate for about 10 minutes to cool slightly.
1¼ cups light brown sugar, ½ cup granulated sugar
Preheat your oven to 325°F (165°C). Line two baking sheets with parchment paper.
Once the butter mixture has cooled, stir in the eggs and vanilla extract until smooth. Add the flour, oats, baking soda, salt, and cinnamon. Stir until just combined—do not overmix. Fold in both the white and semi-sweet chocolate chips.
2 large eggs, 1 teaspoon pure vanilla extract, 2 cups all-purpose flour, 1 cup old-fashioned oats, ½ teaspoon baking soda, 1 teaspoon salt, ¼ teaspoon ground cinnamon, 1 cup white chocolate chips, 1 cup semi-sweet chocolate chips
Using a 2-tablespoon cookie scoop (or spoon), drop dough balls onto the prepared baking sheets, leaving about 2 inches of space between each. Gently flatten the tops with the back of a spoon.
Bake for 11–13 minutes, or until the edges are lightly golden but the centers still look soft. Avoid overbaking to keep them chewy.
Let the cookies cool on the baking sheet for a few minutes before transferring them to a wire rack to cool completely.