Prepare the yellow cake batter using the provided recipes, omitting leavening and eggs from the cake mix.

Combine yellow cake batter, fat-free half-and-half, tea base, milk, sugar syrup, nutmeg, yellow food coloring, vanilla extract, and sugar-free vanilla syrup in a cocktail shaker.

Seal the shaker tightly and shake vigorously for 10 seconds.

Place prepared tapioca pearls at the bottom of a tall glass.

Pour the shaken mixture over the tapioca pearls.

Add ice to the glass to your desired level.

Garnish with candy sprinkles.

Serve immediately with a bubble tea straw.