Garlic Butter Mushrooms with Creamy Polenta and Fontina

This skillet dinner turns humble mushrooms into a luxurious main. King oyster and cremini mushrooms are seared in foaming garlic thyme butter until deeply caramelized, then spooned over creamy polenta and buried under a blanket of melted fontina.

A final shower of Parmesan and fresh thyme adds brightness. It's the kind of meal that feels special enough for company yet comes together in about 45 minutes with one pan and a saucepan.

Mushrooms are the quiet heroes of the kitchen, but here they take center stage. Scoring king oyster mushrooms in a diamond pattern creates a dramatic look and helps them soak up the garlicky butter.

The creamy polenta provides a soft, comforting base, while the fontina melts into a gooey, nutty topping. This recipe is all about texture and flavor: crisp edges, silky polenta, and that irresistible cheese pull.

Ingredients

Why this recipe works

The method of scoring the mushrooms and searing them in foaming butter creates maximum surface area for browning.

The butter foams because it contains water; as it evaporates, the milk solids brown and develop a nutty flavor that coats the mushrooms. This is the same technique used in classic French cooking to build depth in a pan sauce.

Polenta cooked slowly with frequent stirring becomes creamy and tender without any added cream. The natural starch from the cornmeal thickens the water into a silky porridge. Topping it with a rich, buttery mushroom mixture and a layer of melted fontina creates a balanced dish where each component shines.

Notes and substitutions

Choose king oyster mushrooms that are firm and dry, with no slimy spots. Cremini mushrooms should be small to medium, with closed caps.

Aged fontina from Italy has a nutty, sharp flavor that melts beautifully; avoid young fontina which can be bland. Fresh thyme is essential here—dried thyme won't give the same aromatic punch.

A cast iron skillet is ideal for searing because it holds heat well and creates a deep crust. If you don't have one, use a heavy stainless steel pan. Quick-cooking polenta is convenient, but stone-ground polenta will give a more textured, corn-forward flavor; just adjust the cooking time according to the package.

• king oyster mushrooms: Use shiitake or portobello mushrooms for a similar meaty texture.
• fontina cheese: Substitute with Gruyère or provolone for a similar melt and nutty flavor.
• quick-cooking polenta: Use stone-ground polenta, but cook according to package directions (usually longer).
• fresh thyme: Use 1 tsp dried thyme if fresh is unavailable.

Equipment

• Box grater
• Cast iron skillet
• Medium saucepan
• Wooden spoon
• Chef's knife
• Cutting board