Step 1: In a small saucepan, combine the cookie butter, brown sugar (if using), and hot water. Place over medium-low heat.
Step 2: Stir constantly with a whisk until the cookie butter is fully melted and the sugar has dissolved, creating a smooth, thick syrup. Remove from heat and set aside.
Step 3: Brew your coffee according to your preferred method. Prepare 1-2 shots of espresso or 4-6 oz of strong-brewed coffee.
Step 4: Heat your milk in a microwave-safe mug or small saucepan until hot but not boiling. For frothing, use a milk frother or whisk vigorously until airy.
Step 5: Pour 2-3 tablespoons of the prepared cookie butter syrup into your serving mug. Adjust to your sweetness preference.
Step 6: Add the freshly brewed coffee to the mug, stirring gently to combine with the cookie butter syrup.
Step 7: Slowly pour the frothed milk into the mug, holding back the foam with a spoon initially, then spooning it on top.
Step 8: Garnish with a drizzle of extra cookie butter syrup, a sprinkle of cinnamon, or crushed Biscoff cookies, if desired. Serve immediately and enjoy your homemade Cookie Butter Latte!