If there is one dish that has stood the test of time and found its way into countless family gatherings, it’s Grandma’s Onion Squares Recipe. This delightful blend of sweet caramelized onions, creamy Swiss cheese, and a buttery crescent roll crust creates a savory treat that’s as comforting as a warm hug. Whether you’re bringing it to a potluck or just craving a snack that’s full of flavor and texture, these onion squares never fail to impress with their golden crust and luscious filling.
Ingredients You’ll Need
Simple ingredients come together brilliantly in Grandma’s Onion Squares Recipe. Each one plays a vital role—from the flaky crescent roll dough that forms a buttery base to the tender sauteed onions that provide that rich, sweet flavor packed with savory nuances.
- 1 sheet refrigerated crescent roll dough: This forms a flaky, buttery crust that’s easy to work with and adds irresistible texture.
- 2 tablespoons unsalted butter: Essential for caramelizing the onions to perfection, adding richness without overpowering.
- 2 large yellow onions (thinly sliced): Their natural sweetness caramelizes beautifully and forms the heart of the dish.
- 1/2 teaspoon salt: Enhances the flavor balance, especially bringing out the sweetness in the onions.
- 1/4 teaspoon black pepper: Adds a subtle kick that brightens the savory profile.
- 1/2 teaspoon dried thyme: Brings an herbaceous depth that complements the cheese and onions wonderfully.
- 1 cup shredded Swiss cheese: Melts into savory, nutty gooeyness that binds the filling perfectly.
- 1/4 cup mayonnaise: Adds creaminess and a slight tang that rounds out the flavors beautifully.
- 1 large egg (beaten): Helps to set the filling, giving it a custard-like richness.
- 1 tablespoon all-purpose flour: Provides structure so the filling holds together when cut into squares.
How to Make Grandma’s Onion Squares Recipe
Step 1: Prepare Your Baking Dish and Dough
Start by preheating your oven to 375 degrees Fahrenheit (190 degrees Celsius) and lightly grease a 9×9-inch baking dish. Then carefully unroll your crescent roll dough, pressing it firmly across the bottom of the dish. Make sure to seal any seams so it becomes one even layer that will bake into a crisp, buttery crust.
Step 2: Caramelize the Onions
In a large skillet, melt that glorious butter over medium heat. Toss in your thinly sliced onions plus salt, black pepper, and thyme. The magic happens here as you gently cook and stir for 15 to 20 minutes, coaxing the onions to soften and turn a rich golden brown that brings out their natural sweetness.
Step 3: Mix the Filling
While those onions work their magic, grab a bowl and whisk together the shredded Swiss cheese, mayonnaise, beaten egg, and flour. When the onions are perfectly caramelized, stir them right into this creamy mixture. This blend is the creamy, cheesy, onion-packed filling you’re craving.
Step 4: Assemble and Bake
Spread that heavenly filling evenly over your crescent dough crust in the baking dish. Slide it into the oven and bake for 20 to 25 minutes until the top is beautifully golden and fully set. Let it cool slightly before you slice into those perfect squares of savory goodness.
How to Serve Grandma’s Onion Squares Recipe
Garnishes
A sprinkle of freshly chopped parsley or a light dusting of paprika can add a nice pop of color and a hint of freshness that makes these onion squares even more inviting.
Side Dishes
This recipe pairs wonderfully with a crisp green salad for a lighter meal or alongside a bowl of creamy tomato soup for a cozy twist. The hearty and savory flavors hold up well to fresh, bright sides.
Creative Ways to Present
Try arranging the squares on a rustic wooden board or a colorful serving platter for parties. You can also place toothpicks into each square to make them perfect finger foods at gatherings. For a fun twist, layer the filling between two sheets of dough for a double-decker punch of flavor.
Make Ahead and Storage
Storing Leftovers
Once cooled, store any leftover onion squares in an airtight container in the refrigerator. They will stay fresh and flavorful for up to 3 days, making for a wonderful snack or quick lunch.
Freezing
You can freeze the baked squares by wrapping them tightly in plastic wrap and aluminum foil. Frozen, they last up to one month. Thaw them overnight in the refrigerator before reheating.
Reheating
Reheat leftover onion squares in a 350-degree oven for about 10 minutes or until warmed through. This helps maintain their crisp crust and melty cheese filling for that just-baked experience.
FAQs
Can I use a different cheese instead of Swiss?
Absolutely! While Swiss is traditional, Gruyère or sharp cheddar also work beautifully, giving the dish a different but equally delicious flavor profile.
Is it necessary to use mayonnaise in the filling?
Mayonnaise adds creaminess and moisture, helping the filling set nicely, but you can substitute with sour cream or Greek yogurt if you prefer a lighter option.
Can I make this recipe vegan or dairy-free?
With some adjustments like using vegan crescent dough, dairy-free cheese, and a plant-based mayo, you can definitely create a vegan version of Grandma’s Onion Squares Recipe with great results.
What if I don’t have crescent roll dough?
Puff pastry or even a homemade shortcrust dough can be substituted, though the texture will vary slightly from the classic buttery crescent roll base.
How long can I keep the caramelized onions before baking?
You can prepare the caramelized onions a day in advance and store them in the refrigerator. This makes putting together the recipe quick and easy when you’re ready to bake.
Final Thoughts
There’s something truly special about Grandma’s Onion Squares Recipe that keeps it close to so many hearts and dinner tables. The comforting blend of sweet caramelized onions and gooey cheese nestled in a buttery crust is pure magic. If you haven’t made this nostalgic classic yet, I can’t recommend it enough—give it a try and watch it become your new favorite go-to savory treat that everyone asks for again and again.
Print
Grandma’s Onion Squares Recipe
- Prep Time: 15 minutes
- Cook Time: 25 minutes
- Total Time: 40 minutes
- Yield: 9 squares
- Category: Appetizer
- Method: Baking
- Cuisine: American
- Diet: Vegetarian
Description
Grandma’s Onion Squares are a delicious, savory appetizer featuring caramelized onions and melted Swiss cheese on a buttery crescent roll crust. Perfect as a party snack or potluck treat, these squares offer a comforting blend of flavors with a tender, golden-baked topping.
Ingredients
Base
- 1 sheet refrigerated crescent roll dough
- 2 tablespoons unsalted butter
Onion Filling
- 2 large yellow onions, thinly sliced
- 1/2 teaspoon salt
- 1/4 teaspoon black pepper
- 1/2 teaspoon dried thyme
Topping Mixture
- 1 cup shredded Swiss cheese
- 1/4 cup mayonnaise
- 1 large egg, beaten
- 1 tablespoon all-purpose flour
Instructions
- Preheat Oven and Prepare Dish: Preheat the oven to 375°F (190°C) and lightly grease a 9×9-inch baking dish to prevent sticking.
- Prepare Crescent Dough Base: Unroll the crescent roll dough and press it firmly into the bottom of the baking dish, making sure to seal any seams so that it forms a flat and even crust.
- Sauté Onions: In a large skillet over medium heat, melt the butter. Add the thinly sliced onions along with salt, black pepper, and dried thyme. Cook for 15 to 20 minutes, stirring occasionally, until the onions become soft, caramelized, and golden brown.
- Mix Topping: In a separate bowl, combine shredded Swiss cheese, mayonnaise, beaten egg, and all-purpose flour. Mix until well combined, then fold in the sautéed onions evenly.
- Assemble and Bake: Spread the onion and cheese mixture evenly over the crescent dough in the baking dish. Bake in the preheated oven for 20 to 25 minutes, or until the top is golden brown and fully set.
- Cool and Serve: Allow the onion squares to cool slightly before cutting into 9 squares. Serve warm or at room temperature as a flavorful appetizer.
Notes
- These onion squares can be enjoyed warm or at room temperature, making them ideal for parties or potlucks.
- Try substituting Swiss cheese with Gruyère or cheddar for a different flavor profile.
