Clean the oysters thoroughly under cold water.
Use a brush to remove any debris from the shells.
Refrigerate them until needed.
Melt butter in a large skillet over medium heat.
Add the minced shallots and sauté for 3-4 minutes.
They should become fragrant and slightly translucent.
Season the oysters with Cajun seasoning and paprika.
Place them in the skillet with the sautéed shallots.
Cook for about 2 minutes on each side.
Add spinach, mushrooms, and green onions to the skillet.
Allow them to wilt down and become tender.
This should only take about 3-5 minutes.
Sprinkle the grated Parmesan cheese over the oysters.
Let it melt and coat the oysters evenly.
Serve with lemon wedges on the side for added zest.