• Skip to primary navigation
  • Skip to main content
  • Skip to primary sidebar
  • Skip to footer

Slice of Jess

Changing the way you eat, one slice at a time.

  • About Me
    • Privacy Policies
  • Press
  • Recipes
  • Travel & Dining
  • Collaborate
    • MEDIA KIT
    • Collaborate
    • Recipe Development
    • Photography
  • Contact Us

Au Gratin Potatoes Recipe with Boursin and TomaTruffle

September 27, 2023 By Jessica Leave a Comment

My family is obsessed with this ultra creamy, cheesy Au Gratin Potatoes Recipe. Baked until golden and with crispy edges, ahhh perfection! You’re gonna love it!

Au Gratin Potatoes Recipe

It’s officially fall, so we’re busting out all of our cozy, comfy, warm-up-our-belly favorites. These pair flawlessly nestled up next to main dishes like My Grandma June’s Home-Style Chicken Meatloaf, this No-Fuss Golden Sage Thanksgiving Turkey, or as a bedding for Chipotle Braised Pot Roast.

WATCH OUR VIDEO ON THE GRAM!

Au Gratin Potatoes Recipe

WHAT YOU’LL NEED FOR THIS RECIPE:

These are simple ingredients you probably already have handy… except maybe the TomaTruffle Cheese (which I highly recommend trying if you haven’t). The addition of truffle flavors here is extraordinary, trust me on this one.

  • Yukon Gold Potatoes
  • Yellow Onion
  • Salt & Black Pepper
  • Butter
  • Flour
  • Heavy Cream
  • Dry Ground Mustard
  • Garlic & Herb Boursin Cheese
  • TomaTruffle Cheese
  • Mozzarella Cheese
  • Grated Parmesan

While I prefer Yukon gold potatoes, you could certainly swap them out for red-skinned potatoes if that’s what you have on hand. Both of these have very delicate skin, which requires no peeling. Hooray for less work and dishes in the kitchen! Just make sure to slice them as thin as possible for the best results. 

Au Gratin Potatoes Recipe

WHAT’S THE DIFFERENCE BETWEEN AU GRATIN AND SCALLOPED POTATOES?

While these are both similar and popular side dishes, Au Gratin includes the addition of cheese. Scalloped potatoes will also use milk to make a roux instead of heavy cream. Both are insanely delicious, and I’m just realizing now that I don’t have a scalloped version on my blog. That will change soon, I promise! Stay tuned.

CAN YOU MAKE THIS AHEAD OF TIME?

You betcha! They’re the perfect  day ahead side dish for hosts who need to make other items the day of during the holidays. 24 hours in advance, make the entire recipe, including the cheesy sauce, and assemble. Be sure the cheese sauce covers all the potatoes to prevent discoloring. Cover with plastic wrap and place in the fridge. When you’re ready to bake, remove from the fridge and set on the counter for 30 – 40 minutes. Then start at step 5 the baking instructions below! 

MORE APPS & SIDE DISHES YOU’LL LOVE:

Lightened Up Yellow Squash Casserole

Mind-Blowing Southern Baked Macaroni and Cheese

Grandma June’s Fully Loaded Mashed Potato Casserole

Mini Spinach Pies with Whipped Ricotta

Salami and Cream Cheese Stuffed Wontons

Tomato Bruschetta with Pesto, Blue Cheese, and Hot Honey

Mini Brie and Apple Sandwich Crostinis

Southern Pimento Cheese

VIEW ALL RECIPES BY CLICKING HERE!

Au Gratin Potatoes Recipe

Au Gratin Potatoes Recipe with Boursin and TomaTruffle
 
Print
Prep time
15 mins
Cook time
1 hour 30 mins
Total time
1 hour 45 mins
 
My family is obsessed with this ultra creamy, cheesy Au Gratin Potatoes Recipe. Baked until golden and with crispy edges, ahhh perfection!
Serves: 8
Ingredients
  • 6 Yellow Potatoes, sliced thin (about 2.5 lbs)
  • ½ Yellow Onion, sliced thin
  • 2 tbsp. Butter
  • 2 tbsp. Flour
  • 1 cup Heavy Cream
  • 1 tsp. Dry Ground Mustard
  • 1 (5.2 oz) Garlic & Herb Boursin Cheese
  • 6 oz TomaTruffle Cheese, shredded
  • 2 tsp. Salt
  • 2 tsp. Black Pepper
  • 1 cup Shredded Mozzarella Cheese
  • 3 tbsp. Grated Parmesan
Instructions
  1. Preheat the oven to 400F.
  2. Slice the onion and set aside. Wash and thinly slice the potatoes.
  3. Melt butter in a stockpot and then add the flour. Whisk together and cook for 3 minutes. Then add the heavy cream, dry ground mustard, and continue to whisk over medium heat until bubbly. Remove from heat and add the Boursin and TomaTruffle cheeses. Continue to mix until melted and thickened.
  4. Layer half of the potatoes in a greased 9x13 baking dish. Then evenly add a layer of sliced onions, sprinkle with 1 teaspoon each of salt and pepper, and top with half of the cheese sauce.
  5. Add second layer of potatoes, sprinkle with remaining salt and pepper, then top with remaining cheese sauce. Sprinkle with shredded mozzarella and parmesan. Cover with foil (sprayed with cooking spray so the cheese doesn't stick) and bake for 1 hour. Then remove the foil and bake for an additional 25. For a crispy exterior, turn the broiler on for 5 minutes at the end before removing from the oven.
  6. Allow the potatoes to cool for at least 15 - 20 minutes before serving.
3.5.3251
 

NOTES ON THIS RECIPE:

  • If you don’t have TomaTruffle Cheese, you can certainly swap it out with Gruyere, Swiss, Havarti, or Provolone. Any melting cheese will work, but I do like the extra tang those last four bring to this recipe.
  • Always grate your own cheese for the tastiest results, as pre-shredded cheeses will not melt as nicely. 
  • I like to top mine with herbs for a bit of freshness. Here I used thyme and oregano, but rosemary and fresh parsley taste great as well. Heck, add all of them if you’d like!
  • Leftovers should be kept in an air tight container, refrigerated, and consumed within 2 days. 

Au Gratin Potatoes Recipe


PIN THIS FOR LATER:


Au Gratin Potatoes Recipe

Filed Under: Appetizers & Sides, Vegetarian

Previous Post: « Cuban Mojo Chicken with Charred Scallion Chimichurri
Next Post: Skillet Chicken Tamale Pie with Cheesy Cornbread »

Reader Interactions

Did you make this recipe?

Tag @sliceofjess on Instagram & hashtag #sliceofjess.

Share this...
Share on facebook
Facebook
Share on pinterest
Pinterest
Share on twitter
Twitter
Share on linkedin
Linkedin

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

Recipe Rating




Rate this recipe:  

Primary Sidebar

Hey there, Jess here. Welcome to a slice of my kitchen! Here you'll find tidbits of my everyday life, home cooked meals and travel guides. Thanks for stopping by!

Join Our Email List!

Recent Posts

  • The Best Homemade Hamburger Patties Recipe July 10, 2025
  • One Skillet Hungarian Chicken Papikash June 27, 2025
  • Bright and Flavorful Chipotle Chicken Tacos June 23, 2025
  • Slow Cooker Chipotle Honey Chicken Recipe June 20, 2025
  • Crispy Air Fryer Ranch Chicken Recipe For Sandwiches June 2, 2025

Footer

MORE RECIPES

Pork Loin
Italian Sub
Buddha Bowl
Lasagna Soup
Slow Cooker Meatballs
Chicken Shawarma
Copyright Slice of Jess ©2025