Mix together all of your dry ingredients. Mix the flour, baking powder, salt and baking soda.
In your stand mixer, crack and beat your eggs. I do this at a slow-medium speed as you do not want to fluff the eggs just beat them. Add your other wet ingredients into your stand mixer. Add the yogurt, milk and melted butter.
Mix your batter with the spatula attachment until batter is together.
After Mix-ins have cooled gentled fold them into your waffle batter evenly. I like to do a little bit of each, then fold, a little bit of each then fold. This helps to insure that the mix-ins are evenly distributed.