I've made these and they are wonderful. Substitutions are easy as well - I have made them a number of times with varies substitutions. I'd love to add some greek yogurt to pump up the protein content. Any idea how much I should add? Should I leave anything out? There's no milk product or yogurt used in this recipe, so adding it will change the taste and texture profile. It may be best to look for a Morning Glory Muffin recipe that does use milk and sub the same amount of yogurt, thinned to a milk consistency. There are some recipes in other sources (books or on line) that call for 1/4 to 1/3 cup milk or almond milk. We hope you find one that's been tried and tested to work with milk. Enjoy the journey! Irene @ KAF

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