Preheat oven to 350°F (175°C). Line two baking sheets with parchment paper.
Cream butter, granulated sugar, and brown sugar until light and fluffy.
Add eggs one at a time, mixing well. Stir in vanilla.
In a separate bowl, whisk together flour, baking soda, salt, and cinnamon.
Gradually add dry ingredients to wet ingredients, mixing until just combined.
Fold in Cinnamon Toast Crunch cereal and optional white chocolate chips.
Drop rounded balls of dough onto baking sheets, spacing 2 inches apart.
Bake 10–12 minutes or until edges are lightly golden and centers look slightly soft.
Cool on baking sheets for 5 minutes, then move to a wire rack.