2 sprays cooking spray
8 oz cremini mushroom, stems only
4 tsp unsalted butter, divided
1 large uncooked shallot, finely chopped, divided
2 large garlic cloves, minced
1 pinch table salt
5 Tbsp dry white wine, divided
1 tsp thyme, finely chopped
1/4 tsp kosher salt, divided
1/4 tsp black pepper, divided
1 pound lemon sole, or uncooked tilapia fillets, four 4-oz fillets
Preheat oven to 400°F. Coat a medium baking dish with cooking spray.
Pulse mushroom stems in food processor until finely chopped (or chop very finely by hand).
Melt 2 tsp butter in a nonstick skillet over medium-high heat. Add shallot; cook, stirring until tender, 2 minutes. Add garlic; cook, stirring, until just fragrant. Add mushroom stems and pinch salt; sauté until nearly dry, 8-10 minutes. Stir in 1/4 cup wine; cook until almost evaporated. Stir in thyme, kosher salt and pepper; transfer to a shallow dish and allow to cool.
Arrange fish fillets, skin sides up, on a work surface. Spoon about 2 Tbsp mushroom mixture in an even layer over each fillet. Roll up fish from short end to make little bundles; transfer, seam side down, to prepared baking dish.
Drizzle remaining 1 Tbsp wine over fish; dot each with 1/2 tsp butter. Cover loosely with foil; bake until fish is just cooked through, 12 to 14 minutes.
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