Bourbon-Caramelized Onion and Mushroom Flatbread

By Lauren Mitchell, Test Kitchen Director · Reviewed by AislePrompt Editorial · Published 2026-07-31 · Updated 2026-07-31

Flatbread topped with bourbon-infused caramelized onions, sautéed mushrooms, and melted cheese creates a savory, slightly sweet appetizer or light meal. This American-inspired pizza recipe, ready in about 35 minutes, pairs pre-made flatbread, yellow onion, thinly sliced, button mushrooms, sliced for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 320 calories and feeds 4, so it slots cleanly into a weekly meal plan and pairs well with a quick salad or grain on the side. Tap "Plan a meal with the AI" below to drop this recipe into your week and send the ingredients straight to Instacart. Nutrition values are approximate, calculated from USDA FoodData Central (fdc.nal.usda.gov) — verify against ingredient labels for any health-driven dietary plan.

Ingredients

• 1 (10-inch) pre-made flatbread
• 2 medium yellow onion, thinly sliced
• 1 cup button mushrooms, sliced
• 2 tbsp unsalted butter
• 2 tbsp bourbon whiskey
• 1 tbsp brown sugar
• 1 tbsp olive oil
• 1 clove garlic clove, minced
• 1 tsp fresh thyme leaves
• 1 cup shredded mozzarella cheese
• 1 tsp salt
• 1/2 tsp black pepper

Instructions

1. Step 1: Heat 2 tbsp unsalted butter and 1 tbsp olive oil in a large skillet over medium heat until melted and shimmering.
2. Step 2: Add 2 thinly sliced medium yellow onions and 1 tsp salt, cooking for 15 minutes while stirring occasionally until onions soften and start to caramelize.
3. Step 3: Stir in 1 cup sliced button mushrooms, 1 minced garlic clove, and 1/2 tsp black pepper, sautéing for 5 minutes until mushrooms release moisture and brown.
4. Step 4: Pour in 2 tbsp bourbon whiskey and sprinkle 1 tbsp brown sugar over the mixture, stirring continuously for 3-4 minutes until the bourbon reduces and the onions are deeply caramelized.
5. Step 5: Preheat oven to 425°F. Place 1 (10-inch) pre-made flatbread on a baking sheet.
6. Step 6: Spread the bourbon caramelized onion and mushroom mixture evenly over the flatbread.
7. Step 7: Sprinkle 1 cup shredded mozzarella cheese and 1 tsp fresh thyme leaves on top.
8. Step 8: Bake in the oven for 10-12 minutes until the cheese is melted, bubbly, and the flatbread edges are golden and crisp.
9. Step 9: Remove from oven, let cool for 2 minutes, slice, and serve warm.