Step 1: Gather all your ingredients and tools. Ensure heavy cream and milk are well chilled, as cold liquids froth best. Have your frothing tool ready.
Step 2: In a tall glass or a frothing pitcher, combine the 2 tablespoons of smooth cookie butter, 1/4 cup of cold heavy cream, 2 tablespoons of cold milk, and the optional 1-2 teaspoons of powdered sugar. If your cookie butter is very firm, you can gently warm it for 10-15 seconds in the microwave to make blending easier.
Step 3: Submerge your hand-held frother into the mixture, ensuring the whisk is fully immersed. Froth for 30-60 seconds, moving the frother gently up and down, until the mixture thickens, becomes airy, and forms a stable foam with small bubbles. If using a French press, pump the plunger vigorously for 30-45 seconds. If using a blender, blend on low speed until frothy.
Step 4: Check the consistency of your cookie butter cold foam. It should be thick enough to sit atop your drink but still pourable. Avoid over-frothing, which can make it too stiff. Adjust by frothing a little more if too thin, or adding a tiny splash of milk if too thick.
Step 5: Gently spoon or pour the freshly frothed cookie butter cold foam over your favorite iced coffee, cold brew, or iced latte. Garnish with a sprinkle of cinnamon or a drizzle of melted cookie butter if desired. Serve immediately and enjoy your elevated coffee experience!