Use 1/4 teaspoon per cup of coffee or tea, with milk and sugar or sweetener of choice. I use gluten-free oatmilk or almond milk, and some stevia, honey, or maple syrup. Vanilla is a great addition as well.
You can add another 1/4 teaspoon of ginger to each cup, if you want it more gingery.
Alternatively, you can add the spices to a saucepan, along with milk, water, sweetener, and your ground coffee or tea leaves, bring to a boil, simmer for 2 minutes, then strain.