Use your favorite brewing method to brew a pot of coffee.
Take the rumchata and measure 2 oz with the jigger. Pour the rumchata into the coffee mug.
Take the coffee and measure 6 oz with the jigger. Pour the coffee into the coffee mug.note: instead of measuring the coffee, you can pour it straight into the mug if desired. Just top the mug off with it.
If desired, add a large dollop of whipped cream on top.