Copycat Panera Bread Steak & White Cheddar Panini

Do you love the Panera Bread Steak & White Cheddar Panini? You can make it at home. Pickled purple onions are the secret ingredient to this delicious Panera Bread menu item.

Homemade Panera Bread Steak & White Cheddar Panini on a wood board

When you go to Panera Bread what are some of your favorite menu items? One of my hands-down is the Panera Bread Steak & White Cheddar Panini.

The pickled onions on this sandwich make it unique. It is super easy to make pickled onions at home, and they can be used on all sorts of sandwiches, or they can be eaten with your favorite meal.

Steak & White Cheddar Panini ingredients

Ingredients for the Panera Bread Steak & White Cheddar Panini

This sandwich is made from ingredients you are going to find at your local grocery store. You will need some ciabatta bread, sliced roast beef from the deli, pickled red onions, white cheddar cheese, and some horseradish sauce.

You can use a panini press, or you can use a griddle pan, and a heavyweight to help press the sandwich down.

How to make pickled red onions

Pickled red onions take almost 2 minutes to make, and they can be used in oh so many ways. You can enjoy these as a side with grilled meats, on sandwiches, or even in the place of pickles.

I like to slice my onions on a mandolin, but you can use a knife to slice a red onion super thin. Then you will need some vinegar, water, and spices. You literally combine all of these and let them rest for about 15 minutes before you serve them. They taste better with age, so you may even want to keep these on hand all of the time.

Steak & White Cheddar Panini

Can’t get enough of Panera Bread Recipes?

– Check out these recipes.
Panera Bread Cobblestone Muffins
Panera Bread Black Bean Soup
Panera Bread Autumn Squash Soup
Panera Bread Macaroni and Cheese

Homemade Panera Bread Steak & White Cheddar Panini on a wood board

Panera Bread Steak & White Cheddar Panini

Enjoy Panera Bread Steak & White Cheddar Panini, even more, when you make one at home. 
4.5 from 2 votes
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Course: Main Course
Cuisine: American
Keyword: Panera Bread Steak & White Cheddar Panini
Servings: 2
Calories: 916kcal


Pickled Red Onions

  • 1 cup sliced red onions slice thin
  • 1/2 cup white vinegar
  • 1 tablespoon sugar
  • 1 1/2 teaspoons salt
  • 1 cup warm water

Sandwich Ingredients

  • 1 loaf ciabatta bread
  • 2 tablespoons pickled red onions
  • 2 tablespoons horseradish sauce
  • 6 ounces sliced roast beef
  • 4 slices white Cheddar cheese
  • cooking spray for pan


Pickled White Onions

  • Slice onions as thin as possible, I like to use the 1/8 inch setting on my mandolin. Place the onions in a glass jar. In a small bowl combine white vinegar, sugar, salt, and warm water. Stir until the sugar and salt are dissolved. Pour liquid into the jar with onions. These should rest about 30 minutes for using.

Sandwich instructions

  • Split the ciabatta loaf open, spread the horseradish sauce onto the top inside of the split loaf. Add roast beef to the bottom. Add the pickled onions, and cheese.
  • Place the sandwich in the press, and cook about 3 minutes or until the sandwich is heated through.
  • Heat the Panini press. If you do not have a panini press you may want to use a grill pan, and a heavy object to press the sandwich into the pan. Some people like to wrap a brick with foil and use this as a press.


Calories: 916kcal | Carbohydrates: 121g | Protein: 52g | Fat: 23g | Saturated Fat: 13g | Cholesterol: 107mg | Sodium: 4548mg | Potassium: 446mg | Fiber: 4g | Sugar: 10g | Vitamin A: 560IU | Vitamin C: 47.9mg | Calcium: 669mg | Iron: 2.3mg
Tried this recipe?Mention @CopyKatRecipes or tag #CopyKatRecipes!

About Stephanie

I recreate your favorite restaurant recipes, so you can prepare these dishes at home. I help you cook dinner, and serve up dishes you know your family will love. You can find most of the ingredients for all of the recipes in your local grocery store.

Stephanie is the author of's Dining Out in the Home, and's Dining Out in the Home 2.

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Reader Interactions



    4 stars
    These pickled onions are great. You stated they would get better with time & I’m certain they will. Am looking forward to including them in other dishes/salads/sandwiches.

  2. Backliner

    5 stars
    I will definitely try this recipe! It looks so good. I will make a big jar of pickled onions and use it for other dishes.

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