Preheat over 350 degrees and lined baking sheet with parchment paper. Brush both sides of mushroom caps with liquid amigos. Sprinkle BBQ Seasoning on both sides of mahi mahi. Place mushrooms and fish on baking sheet. Bake for 10 minutes then flip mushrooms over and bake another 10 minutes. Remove from oven and cut fish in half. Sandwich fish between the two mushrooms caps.