Once the cake has been baked, remove it from the oven and let it cool. Once cool, crumble about 1/3 of the cake into small pieces. You’ll need 4 cups of crumbled cake.
In a medium size bowl add the white chips and vegetable shortening. Microwave at half power in 30 second intervals, stirring after each, until fully melted. *
Line 1 baking sheet with wax paper. Spread the popcorn over the baking sheet. Drizzle the melted white chocolate over the popcorn, and gently toss to coat. **
Immediately sprinkle the red velvet cake crumbs over the white chocolate covered popcorn. Gently toss until the popcorn is evenly coated with the cake crumbs.
Let the chocolate set. Serve!