These savory puff pastry bites hit all the right notes with sweet caramelized onions, marinated Portobello mushrooms, Applewood smoked cheddar cheese, and a hint of fresh thyme. Although there are several steps required to assemble these tasty morsels, the results are well worth the effort! It takes some time to caramelize the onions, so this recipe is designed to give you plenty of left overs for your efforts. What you don’t use in this recipe can be stored in an airtight container in the refrigerator for a week, or they can be frozen for later use. They are great to have on hand, because they are absolutely delicious on sandwiches, in soups, or on top of your favorite pizza.