Preheat oven to 350°.
Thoroughly wash and clean the mushrooms, remove stems whole.
Finely chop the garlic, mushroom stems. and bell pepper
Saute garlic, mushroom stems, and bell pepper in the butter until all liquid has cooked off.
Mix together 1 tsp cayenne, 1 tsp herb seasoning, cream cheese, shredded cheese, and the cooked mushroom stems and bell peppers. Season with a pinch of salt and some black pepper.
In a separate bowl, season panko crumbs with 1 tsp garlic powder, ½ tsp cayenne, and a pinch of salt.
Lightly toss the mushrooms caps in the olive oil and place top down on a foil lined baking sheet.
Evenly distribute the stuffing among the mushroom caps.
Top mushroom caps with the seasoned panko. (The best way is to spoon the panko on and pat it in to make sure it sticks)
Bake for 25 minutes (or until the panko is golden brown). Time may vary by your oven heat.