Scrape black gills out of mushrooms with a spoon and remove stem.
4 portobello mushrooms, brushed or wiped clean
Brush outsides (tops) of mushroom caps lightly with olive oil. Place mushrooms on a parchment paper lined baking sheet, gill side up; sprinkle with ¼ teaspoon salt and ¼ teaspoon pepper.
In a small bowl, mix together ricotta, tomatoes, mozzarella, Parmesan, basil, and ⅛ teaspoon black pepper. Fill mushroom caps with cheese mixture.
1 cup part-skim ricotta cheese, ½ cup roughly chopped sun-dried tomatoes, ¼ cup part-skim shredded mozzarella cheese, ¼ cup grated Parmesan cheese, ¼ cup chopped fresh basil, ⅛ teaspoon coarse ground black pepper
In a small skillet over medium heat, melt butter. Add garlic, stirring constantly for one minute. Remove from heat. Stir in panko, parsley, oregano, and salt until combined.
1 tablespoon unsalted butter, 2 cloves garlic, finely minced, ½ cup panko breadcrumbs, ¼ cup finely chopped fresh parsley, ½ teaspoon dried oregano, ⅛ teaspoon kosher salt
Spread panko mixture evenly over cheese filling.
Bake mushrooms in the preheated oven until tender and cheese is melted, about 15 to 17 minutes.
Video
Notes
Make-Ahead: Mix up the filling and prepare the breadcrumb topping the night before. Refrigerate both until you're ready to stuff the mushrooms. Plan to add a few minutes to the baking time.
Storage & Reheating Tips: Refrigerate leftovers up to three days, tightly wrapped. To reheat, put the mushrooms on a baking sheet and into a preheated oven (400°F) for ten minutes or until heated through.
Make an appetizer instead. Stuff white button mushrooms with prepared filling; top with panko and bake as directed.