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–+ servings
Caramelized Parmesan Onion Squares and cheese squares stacked on a wooden platter, golden and crispy on top with herbs sprinkled for garnish.

Parmesan Onion Squares

Crowd-pleasing Parmesan Onion Squares with caramelized onions, rich cheese flavor, and a crisp bread base. Perfect for parties, buffets, or make-ahead entertaining.
5 from 1 vote
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Course: Appetizer, Party Food, Snack
Cuisine: American, European-inspired
Keyword: Bread squares in salad, Cocktail rye bread squares, Grecian Party Squares, Onion toast recipe, Parmesan onion mayonnaise toasts, Parmesan toast bites, Pumpernickel squares recipes, Spinach and Artichoke Dip party squares
Prep Time: 30 minutes
Cook Time: 15 minutes
Make-Ahead Chill: 4 hours
Total Time: 4 hours 45 minutes
Servings: 24 squares
Calories: 120kcal
Cost: $10

Equipment

  • 1 Chef’s knife (For uniform onion slicing)
  • 1 Heavy skillet (Provides even heat, prevents onions from burning)
  • 1 Box grater (Fresh Parmesan grating for best flavor & melt)

Ingredients

  • 24 pcs Cocktail rye bread - or pumpernickel squares
  • 3 lg Yellow onions - thinly sliced for caramelizing
  • 1 ½ cups Parmesan cheese - freshly grated from block
  • ½ cup Mayonnaise - creamy base
  • ½ cup Sour cream - adds tang and creaminess
  • 2 tablespoon Butter - for caramelizing onions
  • ½ teaspoon Garlic powder - seasoning
  • ½ teaspoon Black pepper - freshly ground
  • ½ teaspoon Sea salt - season onions at the end
  • 2 tablespoon Fresh chives/parsley - chopped for garnish
  • ½ teaspoon Sweet paprika - for color

Instructions

  • Slice onions uniformly thin for even cooking.
    Onion slices cooking in a skillet with butter and seasonings, slowly softening and beginning to caramelize.
  • Cook onions low and slow in butter over medium-low heat, stirring occasionally, 25–30 minutes until deep golden. Season only at the end.
    Sheet of prepared pastry dough on a baking tray, surrounded by baking tools, eggs, and flour, ready for filling or shaping.
  • Parmesan fresh from block. Combine with mayonnaise, sour cream, garlic powder, and black pepper. Mix until smooth and adjust seasoning.
    Unbaked savory tart in a pie dish, filled with a creamy onion mixture and generously topped with grated Parmesan cheese, surrounded by bowls of ingredients.
  • Arrange bread squares on baking sheets. Spread thin layer of cheese mixture, top with caramelized onions, sprinkle Parmesan, and dust with paprika.
    Freshly baked pull-apart cheese bread in a rectangular pan, golden brown on top with a bubbly, cheesy crust.
  • Preheat oven to 375°F. Bake 12–15 minutes until golden and bubbly. Watch carefully to prevent burning.
    Golden baked Parmesan onion squares cut neatly into rectangles, garnished with fresh herbs, displayed on parchment over a wooden tray.

Notes

Nutrition information is automatically calculated, so should only be used as an approximation.

Nutrition

Serving: 40g | Calories: 120kcal (6%) | Carbohydrates: 11g (4%) | Protein: 4g (8%) | Fat: 7g (11%) | Saturated Fat: 3g (19%) | Polyunsaturated Fat: 1g | Monounsaturated Fat: 2g | Cholesterol: 15mg (5%) | Sodium: 200mg (9%) | Potassium: 75mg (2%) | Fiber: 1g (4%) | Sugar: 2g (2%) | Vitamin A: 200IU (4%) | Vitamin C: 3mg (4%) | Calcium: 100mg (10%) | Iron: 0.7mg (4%)
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