Preheat oven to 375 levels.
Prep 8 x 13 inch baking pan by evenly greasing the pan.
Add crabmeat in a big bowl. Drizzle the lemon juice on the crab. Stir within the panko bread crumbs.
Add melted butter,⅕ cup parmesan cheese, dijon mustard, horseradish, garlic and onion powder. In with the crab combination.
Scoop out the crabmeat combination with a cookie scoop.
Fill the mushroom caps with the combination.
Sprinkle the remaining parmesan cheese on high of the crammed mushrooms.
Bake at 375 levels till the mushrooms change into tender. (About 15-20 minutes).
Take out of the oven and serve instantly.
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