In a small mixing bowl, combine heavy cream, oat milk, brown sugar, and pumpkin pie spice. Whisk together until smooth.

Using a frother or electric mixer, froth the pumpkin cream mixture for about 30 seconds until creamy.

In a tall glass, fill halfway with ice and pour in cold brew or iced latte.

Spoon the pumpkin cold foam over the coffee, creating a layered effect.

Optionally, sprinkle ground cinnamon over the foam for added flavor.