Preheat the oven to 350 degrees F (175 degrees C).
Mix crabmeat, Italian-style bread crumbs, panko, Parmesan cheese, mozzarella cheese, egg, milk, and butter in a bowl until thick yet pliable enough to shape. Divide and roll into 12 1-inch balls.
Gently press balls into mushroom caps and press to spread into a rounded mound atop mushrooms.
Bake in the preheated oven until heated through and golden on top, about 30 minutes.
Nutritional Facts
Per 12 servings
Calories: 166
Carbohydrate: 19g
Fat: 6g
Fiber: 2g
Protein: 12g
Sugar: 3g
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