Balsamic Onion Mushroom Blue Cheese Tarts
Elevate your appetizer game with these irresistible Balsamic Onion Mushroom Blue Cheese Tarts—a delightful combination of buttery puff pastry, sweet caramelized onions, earthy mushrooms, and rich, tangy blue cheese. This recipe strikes the perfect balance of flavors, with savory and sweet notes tied together by the subtle complexity of fresh thyme and balsamic vinegar. The golden, flaky pastry base is easy to prepare and beautifully crisped with a simple egg wash, making these tarts as elegant as they are delicious. Perfect for entertaining or as a sophisticated snack, these gourmet-inspired tarts are ready in just about an hour and are sure to impress at any occasion.
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Recipe Information
Ingredients
- 1 package puff pastry sheet
- 2 tablespoons butter
- 1 tablespoon olive oil
- 2 large yellow onion
- 2 tablespoons balsamic vinegar
- 1 teaspoon brown sugar
- 2 cloves garlic
- 8 ounces mushrooms
- 1 teaspoon fresh thyme
- 4 ounces blue cheese crumbles
- 1 egg
- 1 tablespoon water
- 0.5 teaspoon salt
- 0.25 teaspoon black pepper
Instructions
Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
Thaw the puff pastry sheet according to the package instructions. Once thawed, unfold and cut into 6 equal squares or rectangles. Transfer the pieces to the prepared baking sheet and set aside.
In a medium skillet, heat 1 tablespoon of butter and the olive oil over medium heat.
Thinly slice the onions and add them to the skillet. Cook for 10-12 minutes, stirring occasionally, until they become soft and begin to caramelize.
Stir in the balsamic vinegar and brown sugar. Cook for an additional 2-3 minutes until the mixture is sticky and glossy. Remove the onions from the pan and set them aside.
Thinly slice the mushrooms and mince the garlic.
In the same skillet, melt the remaining 1 tablespoon of butter. Add the garlic and sauté for 1 minute until fragrant.
Add the mushrooms and cook for 5-7 minutes until tender and any liquid released has evaporated. Stir in the fresh thyme, salt, and black pepper. Remove mushrooms from heat.
Use a sharp knife to score a ½-inch border around the edges of each puff pastry square. Be careful not to cut all the way through. Prick the center of each square several times with a fork.
Divide the caramelized onions and mushrooms evenly among the squares, spreading them within the scored borders.
Top each tart with blue cheese crumbles, distributing evenly.
In a small bowl, whisk together the egg and water to make an egg wash. Brush the edges of the pastry with the egg wash to promote golden-brown crisping.
Bake the tarts in the preheated oven for 20-25 minutes or until the pastry is puffed and golden.
Remove from the oven and allow tarts to cool slightly before serving. Garnish with additional thyme if desired.
Nutrition Facts
Calories |
4186 | ||
|---|---|---|---|
% Daily Value* |
|||
| Total Fat | 291.1 g | 373% | |
| Saturated Fat | 89.6 g | 448% | |
| Polyunsaturated Fat | 7.6 g | ||
| Cholesterol | 342 mg | 114% | |
| Sodium | 5750 mg | 250% | |
| Total Carbohydrate | 305.5 g | 111% | |
| Dietary Fiber | 19.8 g | 71% | |
| Total Sugars | 39.2 g | ||
| Protein | 80.2 g | 160% | |
| Vitamin D | 1.7 mcg | 9% | |
| Calcium | 790 mg | 61% | |
| Iron | 17.1 mg | 95% | |
| Potassium | 2453 mg | 52% | |
*The % Daily Value tells you how much a nutrient in a serving of food contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.
