Go Back
–+ servings
Plate of crispy Parmesan onion bread squares cut into neat golden pieces and sprinkled with herbs.

Parmesan Onion Squares

Quick and crowd-pleasing appetizer made with caramelized onions, Parmesan Onion Squares cheese, and bread. Crispy, cheesy, and ready in under 30 minutes. Perfect for parties, potlucks, or last-minute guests.
Print Recipe Pin Recipe
Prep Time 10 minutes
Cook Time 10 minutes
coling time 30 minutes
Total Time 10 minutes
Servings: 12 appetizer squares
Course: Appetizer, Snack, Party Food
Cuisine: American, Italian-inspired
Calories: 95
Ingredients Equipment Method Nutrition Notes

Ingredients
  

  • 6–8 slices Bread _ White wheat, or sourdough
  • 2 medium Yellow onions _ Thinly sliced
  • 1 cup Parmesan cheese _ Freshly grated
  • 3 tablespoon Mayonnaise _ Can sub garlic aioli
  • 2 tablespoon Butter _ For cooking onions
  • ½ teaspoon Garlic powder _ Optional
  • ¼ teaspoon Black pepper _ To taste
  • 2 tablespoon Green onions _ Optional garnish
  • 1 pinch Salt _If needed

Equipment

  • 1 Sharp knife (For slicing onions)
  • 1 Large skillet (To caramelize onions)
  • 1 Baking sheet (For baking bread)
  • 1 Cheese grater (Freshly grate Parmesan)
  • 1 Mixing bowl (Combine filling)

Method
 

  1. Thinly slice onions into even pieces using a sharp knife
    Ingredients laid out on a wooden board including bread slices, onions, butter, mayonnaise, Parmesan cheese, and oil.
  2. Slowly sauté onions in butter until soft golden and sweet
    Fresh onions, garlic, green onions, Parmesan cheese, ground pepper, and chopped herbs displayed on a rustic board.
  3. Let the cooked onions fully cool down before mixing further
    Onions caramelizing in a skillet, turning soft and golden brown with a wooden spatula stirring
  4. Stir onions with Parmesan mayonnaise and seasonings until combined
    Glass bowl filled with grated Parmesan cheese, seasoned with black pepper, with a spoon inside.
  5. Spread the onion cheese mixture evenly across all bread slices
    Slices of toasted bread on a baking sheet topped with cooked onions.
  6. Bake bread with topping until cheese is melted crisp and bubbly
    Close-up of golden-brown Parmesan onion bread squares topped with melted cheese and fresh herbs.
  7. Cut bread into squares and serve them immediately while hot
    Plate of crispy Parmesan onion bread squares cut into neat golden pieces and sprinkled with herbs.

Nutrition

Serving: 40gCalories: 95kcalCarbohydrates: 7gProtein: 4gFat: 6gSaturated Fat: 2.5gPolyunsaturated Fat: 0.5gMonounsaturated Fat: 2gCholesterol: 10mgSodium: 180mgPotassium: 45mgFiber: 0.5gSugar: 1gVitamin A: 90IUVitamin C: 1mgCalcium: 80mgIron: 0.5mg

Notes

Nutrition information is automatically calculated, so should only be used as an approximation.
Tried this recipe?Let us know how it was!