01 -
Preheat the oven to 350°F (175°C) and line a baking sheet with parchment paper.
02 -
In a medium bowl, whisk together flour, baking soda, baking powder, and salt.
03 -
In a large bowl, cream softened butter, granulated sugar, and brown sugar until light and fluffy. Beat in the egg and vanilla extract.
04 -
Gradually add dry ingredients to the wet mixture, stirring until combined. Fold in 1 cup of Fruity Pebbles cereal.
05 -
Scoop small dough balls and roll them in the remaining ½ cup of Fruity Pebbles to coat the outside.
06 -
Place the cookies on the baking sheet and bake for 10-12 minutes, or until the edges are golden. Let cool on a wire rack.
07 -
For the filling: Beat softened butter until smooth. Gradually add powdered sugar and mix until combined. Add vanilla extract and heavy cream, then beat until light and fluffy. Add cream cheese for a tangy flavor, if desired.
08 -
Pipe or spread the filling onto the flat side of one cookie, then top with another cookie to create a sandwich. Repeat with remaining cookies and filling.