Just chop or slice Shiitake’s up and add them in place of a portion of the button mushrooms you already use. The store bought ones are not over powering. Shiitakes will just add a deeper richer flavor to your dish.
If you want to highlight the flavor of shiitakes you just need to do a simpler dish. Try this one. Omit the oyster sause and replace it with soy sause( only because you want to mushrooms to stand out Oyster sause is really powerful and good)
Green Bean and Shiitake Mushroom Stir Fry • Steamy Kitchen Recipes Giveaways
Growing Shiitakes are fun
When a Nor'Easter fells a tree in the woods (Growing Mushrooms) - General Fruit Growing - Growing Fruit