Replace the whole wheat flour. Substitute whole wheat flour with all-purpose flour if you don’t have whole wheat flour on hand (or if you just prefer to use all white flour). You’ll miss out on some of the extra texture whole wheat flour provides, but the recipe will still turn out perfectly fine without it.
Add a splash of vanilla extract. For added depth of flavor, feel free to add 1-2 teaspoons of vanilla.
Add mix-ins. While I haven’t tested this recipe with different mix-ins, I think you could add up to 1 cup of flavor additions, such as blueberries, raspberries, or chocolate chips. Blueberry wheat germ muffins are commonly found at coffee shops and bakeries!