Cheese Crostini with Caramelized Onions, Apples and Thyme

by | Oct 29, 2018 | All, Appetizers, Sponsored

Need a fall-flavored appetizer for your next party? Treat your guests to a plate filled with these delicious Cheese Crostini with Caramelized Onions, Apples and Thyme.

Pieces of Cheese Crostini with Caramelized Onions, Apples and Thyme on a white wooden board. Crostini might just be the perfect finger food.

These bite-sized toasted bread slices act like little plates for all of their tasty toppings. They can be sweet (think these Pomegranate Crostini with Ricotta and Mint) or savory (like these Crostini with Whipped Feta and Tomatoes).

But the fall-flavored ingredients that grace these Cheese Crostini with Caramelized Onions, Apples and Thyme are my current jam. Together they make a delicious way to kickstart any party.

With a minimal number of ingredients in this appetizer recipe, quality ingredients are key to making the most of every bite. That’s why I chose to use Kerrygold® Mild Cheddar Cheese Slices. A quick spin under the broiler effortlessly melts this creamy, mellow cheese made with grass-fed milk.

The remaining ingredients – toasted baguette slices, caramelized onions, green apple slices and a sprinkle of thyme – give you that irresistible sweet, savory and crunchy combination that just can’t be beat and will definitely have you reaching for more.

But before you dive head first into this Cheese Crostini with Caramelized Onions, Apples and Thyme recipe, we have a few points of clarification:

What is the difference between Bruschetta and Crostini?

It’s easy to be confused by the two terms as they both refer to toasted bread.

Crostini actually means “little toasts” in Italian. Think small slices of bread that have been toasted. (This Crostini with Savory Tomato, Bacon and Apple Jam recipe is another one of our favorites.)

Bruschetta, on the other hand, is usually made by toasting larger pieces of bread. Think slices from a loaf of sourdough. Bruschetta is typically served warm after being rubbed with a garlic clove and drizzled with olive oil.

We most often see bruschetta with a variety of tomato-based toppings like our Balsamic Bruschetta or Fresh Tomato Arugula Bruschetta, but the flavor combinations for topping bruschetta are truly endless.

Toasted Cheese Crostini with Caramelized Onions, Apples and Thyme on a Sheet pan with Kerrygold Mild Cheddar Cheese slices. What type of bread do you use for these Cheese Crostini with Caramelized Onions, Apples and Thyme?

A crostini is supposed to be a bite-sized snack, so a baguette is the only bread I use for crostini recipes. It’s small, round size is perfect for appetizers. It takes only a few minutes under a warm broiler to toast to perfection.

Can crostini be made ahead of time?


I will often toast the bread slices earlier in the day and loosely cover them until assembly time. If I know I’m going to be re-toasting the crostini like in this recipe, I often under-toast them the first time around so they become perfectly toasted and warmed through the second time under the broiler.

Doesn’t it take a long time to caramelize onions?

It does take time to achieve caramelization in your onions (rather than simply sautéing them), but the extra effort is soooooooo worth it. Plus you can freeze them to use later! Check out all of our tips for caramelizing onions HERE.

Pass around a plate of these easy Cheese Crostini with Caramelized Onions, Apples and Thyme at your next party, and watch these tasty “toast plates” disappear!

Disclosure: This post was sponsored by Kerrygold®. We only share products with you that we personally use and love. Thanks for supporting the brands that make Garnish with Lemon possible.

Cheese Crostini with Caramelized Onions, Apples and fresh Thyme on a white wooden board.

Craving more toasted bread nibbles? Here are some of our favorite crostini recipes:

Sugar Snap Pea Crostini with Goat Cheese and Arugula – Garnish with Lemon®

Whipped Goat Cheese and Blueberry Balsamic Crostini – The Noshery

Fig and Gruyere Crostini – That Skinny Chick Can Bake

Yield: 20 pieces

Cheese Crostini with Caramelized Onions, Apples and Thyme

Pieces of Cheese Crostini with Caramelized Onions, Apples and Thyme on a white wooden board.

These easy Cheese Crostini with Caramelized Onions, Apples and Thyme are a tasty way to kickstart any party. Perfect party nibbles!

Prep Time 1 hour 5 minutes
Cook Time 5 minutes
Total Time 1 hour 10 minutes


  • 1 tablespoon olive oil
  • 1 tablespoon Kerrygold® Salted Butter
  • 3 large onions, peeled and thinly sliced
  • 1 teaspoon sugar
  • salt
  • 1 baguette, sliced and toasted (about 20 slices)
  • 10 slices Kerrygold® Mild Cheddar Cheese, cut into quarters (they will resemble cracker cuts of cheese)
  • 20 thin slices of Granny Smith apple
  • 2 - 3 tablespoons fresh thyme leaves


  1. Place olive oil and butter in a large pan. Heat on medium-low until butter is melted. Add onions and stir to coat. Cook for 20 minutes, stirring occasionally. Add sugar and continue to cook for another 30 - 45 minutes, stirring occasionally. Season with salt to taste. (Makes about 2 1/2 cups)
  2. Preheat broiler. 
  3. Place baguette slices on baking sheet and broil until evenly toasted. 
  4. Place 1 tablespoon caramelized onions on each baguette slice. Top each slice with 2 quarters/cracker cuts of Kerrygold® cheese. Broil until cheese is melted. Remove from oven. 
  5. Top each warm crostini with one apple slice and sprinkle with fresh thyme leaves. Serve immediately.  

Nutrition Information:



Serving Size:

2 crostini

Amount Per Serving: Calories: 249Total Fat: 13gSaturated Fat: 6gTrans Fat: 0gUnsaturated Fat: 5gCholesterol: 31mgSodium: 447mgCarbohydrates: 24gFiber: 2gSugar: 5gProtein: 11g

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We're the creative juices behind Garnish with Lemon. In the past 8 years, millions of people have sipped & snacked on our recipes. Need easy, delicious party food and drinks for your next shindig? You’ve come to the right place.

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About Anna

Hi, I’m Anna, a former corporate communications nerd turned food fanatic. Turns out I like cooking for others A LOT more than explaining HR policies to them. C’mon over!


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