Add chai tea concentrate to an ice-filled glass. Pour oat milk into the glass.

Top drink with nondairy apple crisp cold foam.

To make the nondairy apple crisp cold foam, mix soy milk, oat milk, apple brown sugar syrup, soy lecithin, and soy protein isolate (if using) in a mason jar and shake to combine. Alternatively, stir all ingredients together in a bowl. If not using right away, keep in an airtight container in the fridge.

Turn the mixture into cold foam right before using. Use an electric frother, hand mixer, or blender to froth, mix, or blend until the mixture turns into a foam.

To make apple brown sugar syrup, put sugar, water, sliced apples, and cinnamon in a medium saucepan and bring to a boil.

Once boiling, lower heat and let simmer for about 15-20 minutes until thickened and apples have softened.

Strain mixture into a bowl, pressing down on the apples to extract as much juice as possible.

Store syrup in a bowl or mason jar in the fridge to cool completely before using.