Prep the Mushrooms: Preheat the oven to 400 degrees. On a baking sheet lined with parchment paper, toss the mushrooms and olive oil together, until well coated.
16 ounces whole mushrooms, 1 Tablespoon olive oil*
Make the Filling: In a bowl, mash together the cream cheese, worcestershire, garlic, thyme, onion powder, salt, and pepper, until smooth.
8 ounces full fat cream cheese, 2 teaspoons worcestershire sauce, 3-4 cloves garlic,, 1 teaspoon dried thyme, 3/4 teaspoon onion powder, 1/2 teaspoon salt, fresh cracked black pepper
Add the Cheese: Fold in the cheddar cheese.
4 ounces (1/2 cup) sharp white cheddar cheese,
Make the Topping: In a separate bowl, mix together the panko, parmesan, and melted butter.
1/4 cup panko bread crumbs, 1 Tablespoon salted butter,, 2 Tablespoons grated parmesan cheese
Stuff the Mushrooms: Spoon the cheese filling into the mushroom. Use a small rubber spatula or the back of a spoon to press it in and level the top.
Add Panko Topping: Sprinkle the top of the mushrooms with the panko mixture and pat down so it sticks.
Stuff Remaining Mushrooms: Repeat with all mushrooms.
Bake Mushrooms: Bake for 20-25 minutes or until golden brown.