You may choose to bake the polenta base a day in advance, and then assemble the canapes on the day of your party!
Keyword Canapes with Mushrooms, Canapes with Polenta, Easy Canapes, Mushroom & Polenta Panapes, Mushroom Canapes, Mushroom Canapes with Polenta Base, Polenta Canapes, Simple Canapes, Vegetarian Canapes