Shell and de-vein shrimp, leaving tails on. Place shrimp in small bowl with salt, oregano, thyme.
In a separate bowl, cream together butter, garlic and parsley.
In a small skillet, sauté mushrooms in butter. Brush seasoning mixture lightly from shrimp, allowing some to remain. Divide the shrimp among six individual oven proof baking dishes; top with sautéed mushrooms and drizzle with remaining butter from skillet.
Spoon garlic butter mixture (as desired) on top of mushrooms.
Bake at 375°F. for 12 minutes or until done.
Garnish each serving with a thin orange slice, cut through to the center on one side and arranged in a twist over the shrimp. Top with a curl of green onion, if desired.
6 servings.