Start by preheating your oven to 350°F (180°C) and line a couple of baking sheets with parchment paper. 

Whisk the flour, baking soda, and salt together in a small bowl until evenly combined.

In a larger mixing bowl, beat the softened butter with the granulated and brown sugars until the mixture looks fluffy and smooth. It’ll take a minute or so with a hand mixer.

Add the egg and vanilla extract and keep mixing until everything’s fully blended and creamy. 

Add the dry mixture and gently mix on low speed until the dough comes together without overmixing. As soon as there are no streaks of flour left, stop mixing. 

Using a spatula, gently mix in 1 ½ cups of Fruity Pebbles cereal and the chocolate chips.

Scoop the dough into balls (about 1½ tablespoons each). Dip just the top of each one into the remaining Fruity Pebbles to give them a fun, colorful topping. 

Place them on the prepared baking sheets, leaving a little space in between.

Put them in the preheated oven and bake for around 10 to 11 minutes. The edges should look set while the centers still seem a little soft, that’s exactly what you want. They'll finish cooking a little on the tray while cooling down.

Rest the cookies on the baking sheet for about 10 minutes before placing them on a wire rack to cool fully. It helps them firm up to the perfect consistency.

Once they’re cooled, they’re ready to enjoy!