Heat oven to 375°F. Wipe mushrooms with damp paper towel; carefully remove stems. Finely chop stems; set aside.
Heat 1 tablespoon oil in skillet over medium; sauté stems and garlic 3-4 minutes until softened. Cool slightly.
Thoroughly mix cream cheese, goat cheese, mint, cooked stems and garlic, salt, and pepper in bowl.
Brush caps with remaining oil; arrange cavity-side up on sheet.
Generously fill caps, mounding slightly.
Mix panko and Parmesan in small bowl; sprinkle over each mushroom.
Bake 15-18 minutes until mushrooms tender and tops golden. Garnish with mint before serving.