1Line an 8x8 pan with foil, spray lightly with cooking spray.
In stand mixer beat together cream cheese, powdered sugar and vanilla until smooth.
In a double boiler, melt white chocolate chips.
Pour melted chocolate into cream cheese mixture and mix together until incorporated.
Turn mixer to low and stir in 1 1/2 cups Fruity Pebbles until mixed in evenly.
Press mixture into prepared pan.
Press remaining 1/2 cup Fruity Pebbles onto the top of fudge and press gently so they stick.
Chill fudge for 1 hour until set.
Cut into squares.