Preheat the oven to 450 degrees F. Line a baking sheet with foil, parchment, or a silicone mat.
Place the red peppers cut side down on the baking sheet. Roast for 20 to 25 minutes until the skin is blistered. Remove them from the oven. Once the peppers are cool enough to touch (speed up the process by rinsing them under cold water), remove the skin. Slice the peppers into thin strips. In a bowl, toss them with a drizzle of olive oil and a clove of minced garlic. Set aside.
While the peppers are roasting, prep the mushrooms. Warm the olive oil in large skillet over medium heat. Add 3 cloves of the minced garlic and the sliced mushrooms. Cook for about 15 minutes, stirring occasionally, until the mushrooms have shrunk and are lightly browned. Add the thyme about halfway through the cooking time and season with salt and pepper. A few minutes before the mushrooms are finished cooking, squeeze in the lemon juice.
Decrease the oven temperature to 400 degrees F after the peppers are finished roasting. Brush each baguette slices with a little olive oil on both sides. Place the slices on a baking sheet and transfer to the oven. Bake for 4 to 5 minutes on each side (8 to 10 minutes total) until lightly toasted.
Assemble the bruschetta by placing some roasted red peppers on top of a toast, followed by a spoonful of the mushrooms. Top with a sprig of thyme if desired. Arrange on a serving platter, and enjoy!
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Notes
Make the pepper and mushroom toppings up to 2 days in advance. Store in an airtight container in the fridge until you are ready to serve the bruschetta.
If you don't need this recipe to be vegan, consider spreading each toast with Boursin cheese before adding the toppings.