Mushrooms
Filling
To make Mushrooms: Preheat oven to 375ºF. Whisk together oil, vinegar, and garlic in bowl. Brush mushroom caps with oil mixture, and place on baking sheet. Roast 30 minutes, or until tender. Drain on paper-towel-lined plate.
To make Filling: Toast breadcrumbs on baking sheet 2 to 3 minutes, or until light brown. Set aside.
Heat oil in skillet over medium heat. Add onion, and sauté 5 minutes, or until soft. Add sun-dried tomatoes and garlic; sauté 30 seconds. Stir in cream, and cook 2 minutes. Add spinach, and cook 3 to 4 minutes, or until spinach is wilted. Stir in cheeses, and cook 2 to 3 minutes. Spoon Filling into mushroom caps, and top with toasted breadcrumbs.