Start by rubbing the lemon zest into the sugar. This releases the essential oils and amplifies the citrus flavor, giving the cookies a fresh, fruity aroma.
Beat together the butter, cream cheese, and lemon-scented sugar until smooth. Add vanilla, egg, and brown sugar, then beat until light and fluffy.
Add flour, baking soda, and salt gradually. Mix on low speed just until incorporated to avoid tough cookies.
Gently fold in the cereal so it’s evenly distributed without crushing it. The dough should remain soft.
Scoop 1/4 cup of dough, roll into balls, coat first in Fruity Pebbles, then in sugar for a crisp outer shell.
Bake at 375°F (190°C) for 9–11 minutes. Let them cool completely to ensure the cereal retains its crispness.