In a microwave safe bowl, place the White Chocolate, and microwave at 15 second intervals until melted. Stir well until smooth and creamy.
Place the Flour in a separate bowl, and microwave for 1 minute. Stir and set aside.
In a separate dish, mix the Butter, Sugar and Vanilla, and stir until well combined. Add the Flour to the Butter mixture, and then add the White Chocolate, and stir well.
Add the Sweetened Condensed Milk, and stir until all ingredients are mixed well. Add the Fruity Pebbles, and stir to mix.
Spray an 8 X 8 dish with Cooking Spray, and pour the Fudge into the dish. Sprinkle Fruity Pebbles on top of the Fudge, and place in the refrigerator for at least one hour.
Cut in 2 X 2 inch pieces and serve. Enjoy!