1. Combine white baking chips, condensed milk, and butter in a large microwave-safe bowl.

2. Microwave on high in 20-second intervals, stirring between each until melted and smooth.

3. Stir mixture until creamy and lump-free.

4. Divide mixture into three equal bowls.

5. Add orange food coloring to one bowl and yellow to another; leave one plain white.

6. Line a bread pan or small square dish with parchment paper.

7. Spread orange mixture on the bottom, then yellow, then white on top.

8. Refrigerate at least 2 hours until firm.

9. Slice into squares and serve.