A delightful appetizer featuring savory sautéed mushrooms infused with fresh thyme, served atop crisp crostini—perfect for entertaining or a cozy snack.

Why You’ll Love This Recipe

These Mushroom Thyme Crostini are rich, aromatic, and easy to assemble. The combination of earthy mushrooms, bright sherry vinegar, and fragrant thyme atop toasted baguette slices creates an elegant yet approachable bite. Ready in under 30 minutes, they’re ideal for gatherings or a simple gourmet treat.

Ingredients

(Tip: You’ll find the full list of ingredients and measurements in the recipe card below.)

Crostini

½ crusty baguette (about 14 slices, each ~¼” thick)
¼ cup olive oil (or butter for non‑vegan)
Salt & pepper, to taste

Mushroom Thyme Topping

16 oz cremini mushrooms, cleaned and sliced (~¼” thick)
1 bunch fresh thyme leaves (plus extra for garnish)
1 shallot, minced (or small onion)
¼ cup sherry vinegar
2 tsp flour
¼ cup vegetable stock (or broth/water)
3–4 Tbsp olive oil or butter
Salt & pepper, to taste

Directions

1. Prepare Crostini

Preheat grill pan or oven.
Brush each baguette slice with 1–2 Tbsp olive oil and season with salt and pepper.
Grill on high heat, or bake at 450 °F on the middle rack for about 7 minutes, flipping halfway until golden and crisp.
Set aside to cool slightly.

2. Make Mushroom Thyme Topping

Heat olive oil (or butter) in a hot skillet. Add mushrooms, minced shallot, and thyme leaves. Sauté for 2 minutes.
Deglaze the pan with sherry vinegar; simmer for 30 seconds.
Sprinkle in flour and stir 30 seconds to coat.
Add stock (or water) and stir until sauce thickens. Add more stock if needed.
Season with salt and pepper to taste.

3. Assemble Crostini

Spoon 1–2 Tbsp of the mushroom mixture onto each crostini.
Garnish with additional fresh thyme leaves and a light drizzle of olive oil.
Serve immediately while warm and crisp.

Servings and Timing

Makes: About 14 crostini
Prep time: ~10 minutes
Cook time: ~15 minutes
Total time: ~25 minutes

Variations

Cheesy option: Add a sliver of goat cheese or dollop of ricotta under the mushrooms.
Gluten-free: Use gluten-free bread or crackers instead of baguette.
Garlic infusion: Sauté minced garlic with the shallot for extra flavor.
Balsamic substitution: Replace sherry vinegar with balsamic vinegar for a sweeter tang.

Storage/Reheating

Crostini: Store toasted slices in an airtight container for up to 2 days; reheat in oven or toaster before serving.
Mushroom topping: Refrigerate leftover topping in a sealed container for 2–3 days. Reheat gently in a skillet with a splash of water.
Assembled crostini: Best served immediately; assembled crostini will soften over time.

FAQs

1. Can I use other mushrooms?

Absolutely—creminis are classic, but shiitake, oyster, or button mushrooms work well.

2. How thick should I slice the mushrooms?

Keep slices around ¼″ thick for consistent sautéing and tenderness.

3. Can I skip grilling and only bake?

Yes—baking at 450 °F gives crisp edges and toasty flavor. Flip halfway through.

4. Why use sherry vinegar?

It adds bright acidity that balances the rich earthiness of mushrooms.

5. Can I use dried thyme?

Fresh thyme is best for flavor and garnish, but dried thyme (1–2 tsp) can be substituted.

6. Is this vegan?

Yes—use olive oil instead of butter and vegetable stock for a vegan-friendly version.

7. How do I prevent sogginess?

Serve immediately after assembling to keep crostini crisp.

8. Can I make ahead?

Yes—prepare mushroom topping ahead and toast crostini just before serving for freshness.

9. What can I serve alongside?

Pair with a glass of white wine, rosé, or a light salad for a refined appetizer course.

10. How to reheat topping?

Reheat leftover mushrooms in a skillet over medium heat, adding a splash of stock if dry.

Conclusion

These Mushroom Thyme Crostini are an elegant treat that bring together simple ingredients for outstanding flavor. They’re quick to prepare, visually appealing, and adaptable for various dietary needs—ideal for casual entertaining or a cozy at-home snack. Enjoy the earthy satisfaction of these delicious bites!