Line a 9x13-inch baking pan with foil. Spray the sides and bottom of the pan with baking spray and set aside.

In a medium-large pot, on the stovetop, add the butter to the pot. Melt the butter over medium-high heat. Once the butter is melted, add seven cups of mini marshmallows to the melted butter. Melt the marshmallows into the butter completely, stirring constantly. Once the marshmallows are completely melted, add the white chocolate and stir for one minute. Remove the pot from the stove and turn the stove off.

Immediately add the vanilla extract and salt to the melted marshmallows and stir. Stir in the Rice Krispies into the marshmallow mixture, one cup at a time, fully mixing in each cup of cereal before adding the next. At the fourth cup of cereal, add the remaining cup of mini marshmallows, and stir into the mixture until combined. Add the remaining cups of cereal. Fold in the Oreo cookie pieces and Easter candies.

Pour mixture out into prepared pan. Spray one hand with baking spray to gently push the marshmallow treats so there is an even layer in the pan. Do not push hard on the treats or you will get tough treats. Add the sprinkles on top.

Allow treats to set and cool in the pan completely before cutting into desired sized squares.