Step 1

Preheat oven to 350 degrees.

Step 2

In a small saute pan, heat butter over medium heat. Add onion and garlic and saute for approximately 1 minute. Add mushrooms and season with salt and pepper and rosemary. Stir and cook until mushrooms begin to brown. Remove from heat.

Step 3

Place brie onto a rimmed baking sheet and bake for 10-12 minutes until warmed through and softened.

Step 4

To serve: Place brie onto serving platter. Top with mushrooms and serve with toasted baguette slices.