Transfer the casserole dish to the preheated oven and bake for 25–30 minutes, or until the mushrooms are deeply browned, the centers look juicy and bubbly, and the bacon is rendered and crisp with dark, caramelized edges. If your bacon is very thick, you may need an extra 5 minutes.
For extra crisp edges, move the dish to the top rack for the last 3–5 minutes of baking. Watch closely so the bacon darkens without burning; a few blackened spots are desirable and add that smoky, meaty character.
Carefully remove the dish from the oven and let the mushroom bacon bakes rest for 5 minutes. This brief rest allows the sizzling juices to settle slightly so guests don’t burn their mouths and the flavors concentrate.
Serve the mushroom bacon bakes hot, directly from the ceramic dish. Use small tongs or cocktail forks for easy grabbing, and encourage guests to take a moment before biting in—the centers stay surprisingly hot and juicy.
