I start by adding the heavy cream, maple syrup, pumpkin puree, and pumpkin pie spice into a small bowl or a jar with a spout. Using a spouted container makes pouring the cream later so much easier. Give everything a quick stir first so the pumpkin puree doesn't clump at the bottom.
Next, I use a handheld milk frother to whisk the mixture until it turns thick, pale, and foamy, which usually takes under a minute. If you don't have a frother, a regular whisk or even a tightly sealed jar you shake works just as well. You're looking for a texture similar to softly whipped cream, not stiff peaks.
I grab a tall glass, about 12 to 16 ounces, and fill it most of the way with ice cubes. Then I pour in the cold brewed coffee, leaving a couple of inches of space near the top. That extra room is exactly where the pumpkin cream is going to sit.
Finally, I spoon the pumpkin cream mixture right on top of the cold brew so it floats and creates that signature layered look. I like giving it one gentle stir with a long straw or spoon right before my first sip so every mouthful gets a bit of that pumpkin flavor. And that's it — your homemade pumpkin cream cold brew is ready to enjoy.