Great alternatives from the typical flour and egg coating steps would be; 1. You can soak in heavy cream for an hour. 2. For a dairy free option without milk you could use melted butter and some lemon. 3. Honey mustard is another option that works well and adds a ton of flavor. 4. Plain Greek yogurt will help the breadcrumbs and seasonings stick quite well. 5. Brushing meat with mayonnaise brings a ton of moisture, but is egg based so not a good options if you are allergic to that food.