Butter a 9 x 13 in. baking dish, or coat with cooking spray, set aside.

In a large saucepan melt butter over low heat.

Once melted, stir in marshmallows.

Continue stirring and cook over low heat until marshmallows are completely melted.

Remove from heat and stir in cocoa krispies until well coated.

Stir in milk chocolate toffee bits.

With a buttered spatula, press mixture into prepared baking dish.

Once cooled, melt chocolate chips and drizzle over krispie treats.

Melt white chocolate squares and drizzle over krispie treats (I used vanilla Candiquik).

Let chocolate cool, cut into squares and enjoy!