Description
Grandma’s Onion Squares are a deliciously savory appetizer featuring caramelized onions, creamy Swiss cheese, and flaky crescent roll dough baked to golden perfection. Perfect for potlucks or casual gatherings, these squares offer a flavorful and easy-to-make treat that can be enjoyed warm or at room temperature.
Ingredients
Scale
For the Dough
- 1 sheet refrigerated crescent roll dough
- 2 tablespoons unsalted butter
For the Onion Mixture
- 2 large yellow onions, thinly sliced
- 1/2 teaspoon salt
- 1/4 teaspoon black pepper
- 1/2 teaspoon dried thyme
For the Cheese Mixture
- 1 cup shredded Swiss cheese
- 1/4 cup mayonnaise
- 1 large egg, beaten
- 1 tablespoon all-purpose flour
Instructions
- Prepare the oven and dish: Preheat the oven to 375°F (190°C) and lightly grease a 9×9-inch baking dish to prevent sticking.
- Form the crust: Unroll the crescent roll dough and press it firmly into the bottom of the baking dish, making sure to seal any seams so the dough forms a flat and uniform crust.
- Sauté the onions: In a large skillet, melt the unsalted butter over medium heat. Add the thinly sliced onions, salt, black pepper, and dried thyme. Cook for 15–20 minutes, stirring occasionally, until the onions become soft, golden brown, and caramelized.
- Mix the cheese filling: In a separate bowl, combine the shredded Swiss cheese, mayonnaise, beaten egg, and all-purpose flour. Stir until the mixture is well blended.
- Combine onions and cheese mixture: Fold the sautéed onions into the cheese mixture, ensuring they are evenly incorporated.
- Assemble the squares: Spread the onion and cheese mixture evenly over the crescent roll dough crust in the dish.
- Bake: Place the baking dish in the oven and bake for 20–25 minutes or until the top is golden brown and set.
- Cool and serve: Allow the onion squares to cool slightly before cutting into 9 even squares and serving warm or at room temperature.
Notes
- These onion squares are delicious both warm and at room temperature, making them perfect for parties and potlucks.
- For a flavor variation, substitute Swiss cheese with Gruyère or cheddar cheese.
- Ensure onions are caramelized properly to deepen the flavor and sweetness of the dish.
- You can prepare the onion mixture a day ahead and assemble before baking to save time.
- Prep Time: 15 minutes
- Cook Time: 25 minutes
- Category: Appetizer
- Method: Baking
- Cuisine: American
Nutrition
- Serving Size: 1 square
- Calories: 220
- Sugar: 3g
- Sodium: 360mg
- Fat: 14g
- Saturated Fat: 6g
- Unsaturated Fat: 7g
- Trans Fat: 0g
- Carbohydrates: 17g
- Fiber: 1g
- Protein: 6g
- Cholesterol: 35mg
