In a heavy saucepan, heat oil over medium-high heat. Add the shiitake and portobello mushroom slices, garlic, and sage. If youre using dried basil and thyme, add them now. Cook over medium-high heat for about 15 minutes or until mushrooms are tender and browned, stirring occasionally. Remove from heat. If youre using fresh basil and thyme, add them now with the snipped fresh parsley.