I gently wiped each mushroom with a damp towel and removed the stems. Scooping out the gills creates extra space for stuffing and prevents excess moisture during baking.
I filled a bowl with olive oil and white wine, then soaked the mushrooms for a few minutes. This simple trick keeps them juicy, plump, and far from rubbery.
In a skillet, I cooked shallots, garlic, and the white parts of the scallions. Adding panko at this stage ensures it absorbs flavors while staying crisp. I reserved the green parts of scallions for later.
I chopped shrimp into a sticky paste in my food processor, then mixed it with the cooled panko mixture and parmesan. The texture should be slightly sticky but easy to mound onto each mushroom.
Using a teaspoon, I generously filled each mushroom cap, mounding the mixture on top. I sprinkled extra parmesan over each for a golden crust when baked.
I placed the mushrooms on a baking sheet in a single layer and baked until lightly browned. Serving them warm ensures the shrimp stays tender and the tops stay crisp.