Preparation

• Position a rack in the center of the oven and heat the oven to 450°F.
• In a small bowl, combine 2 Tbs. of the oil and about two-thirds of the minced garlic. Brush the insides of the mushroom caps with the garlic oil and sprinkle generously with salt and pepper. Arrange the mushrooms oiled side up on a rimmed baking sheet and roast until just tender, about 10 minutes. 
• Meanwhile, in a medium bowl, mix the cream cheese, mayonnaise, and 1/2 tsp. of the thyme with the back of a wooden spoon. Stir in the spinach and artichokes and season to taste with salt and pepper. In another medium bowl, combine the remaining garlic, 1 Tbs. oil, and 1 tsp.  thyme with the breadcrumbs and cheese. 
• Spoon the artichoke mixture evenly into the mushroom caps and sprinkle with the breadcrumb mixture. Bake until the crumbs are golden-brown and the filling is hot, about 10 minutes. Serve immediately.

Looking for a side dish to go with? Try this Roasted Rosemary Butternut Squash.