Our Favorite Side Dish
OUR FAVORITE SIDE DISH is a medium American recipe that serves 4. 620 calories per serving. Recipe by Karissa Stevens on YouTube.
Prep: 28 min | Cook: 1 hr 17 min | Total: 2 hrs
Cost: $9.07 total, $2.27 per serving
Ingredients
- 4 pieces Russet Potatoes (large, skin left on, washed and sliced thinly)
- 2 tablespoons Avocado Oil (for greasing the casserole dish)
- 3 teaspoons Unsalted Butter (melted)
- 6 cloves Garlic (large, minced)
- 2 sprigs Fresh Rosemary (chopped)
- 1.5 cups Heavy Cream (full-fat)
- to taste Salt
- to taste Black Pepper
- 1 cup Mozzarella Cheese (shredded, pre-shredded fine)
- 0.5 cup Romano Cheese (shredded)
- 1 sheet Aluminum Foil (to cover dish)
Instructions
Preheat Oven
Preheat the oven to 350°F.
Time: PT10M
Temperature: 350°F
Slice Potatoes
Wash the potatoes, leave the skins on, and slice them as thin as possible (about 1/8 inch) using a sharp knife or mandolin.
Time: PT10M
Prepare Garlic‑Rosemary Butter
Melt 3 teaspoons of butter in the microwave (about 20 seconds). Stir in the minced garlic and chopped rosemary.
Time: PT5M
Mix Cream and Butter
In a measuring cup, combine the melted butter‑garlic‑rosemary mixture with 1½ cups heavy cream. Add salt and pepper, then whisk until smooth.
Time: PT3M
Grease Dish & First Layer
Drizzle 2 tablespoons avocado oil into the bottom of the casserole dish and spread evenly. Arrange a single layer of potato slices, overlapping slightly. Pour about one‑third of the cream mixture over the potatoes, then sprinkle 1/3 cup mozzarella and a pinch of Romano cheese.
Time: PT5M
Second Layer
Add a second layer of potatoes, pour another third of the cream mixture, and sprinkle another third of the mozzarella and Romano cheeses.
Time: PT5M
Final Layer & Cover
Add the remaining potatoes, pour the rest of the cream mixture, and top with the remaining mozzarella and Romano. Cover the dish tightly with aluminum foil.
Time: PT5M
Bake Covered
Place the covered dish in the preheated oven and bake for 45 minutes.
Time: PT45M
Temperature: 350°F
Bake Uncovered
Remove the foil and continue baking for another 30 minutes, or until the potatoes are fork‑tender and the top is golden.
Time: PT30M
Temperature: 350°F
Broil
Switch the oven to broil and place the dish under the broiler for 2 minutes, until the cheese is bubbly and lightly browned.
Time: PT2M
Temperature: Broil
Rest
Remove the gratin from the oven and let it rest for 5 minutes before serving.
Time: PT5M
Nutrition Facts
- Calories
- 620
- Protein
- 20g
- Carbohydrates
- 70g
- Fat
- 38g
- Fiber
- 8g
Dietary info: Vegetarian, Gluten-Free
Allergens: Dairy, Garlic
Ingredient Substitutions
- Instead of Russet Potatoes: Yukon Gold potatoes, sweet potatoes (will change flavor)
- Instead of Avocado Oil: olive oil, vegetable oil
- Instead of Unsalted Butter: margarine
- Instead of Garlic: garlic powder (1 tsp)
- Instead of Fresh Rosemary: dried rosemary (1/2 tsp)
- Instead of Heavy Cream: half-and-half (will be less rich), milk + butter
- Instead of Mozzarella Cheese: provolone, cheddar
- Instead of Romano Cheese: Parmesan cheese
Equipment Needed
- Casserole Dish
- Knife
- Cutting Board
- Microwave‑Safe Measuring Cup
- Mixing Bowl
- Spoon/Spatula
- Aluminum Foil
Critical Steps — Do Not Skip
- Slice potatoes thinly
- Season cream mixture
- Cover dish tightly with foil
- Bake covered for 45 minutes
- Uncover and bake additional 30 minutes
- Broil for 2 minutes
Chef Tips from the Video
- A mandolin gives the most uniform slices, but a sharp knife works fine.
- Pat the sliced potatoes dry with a kitchen towel to reduce excess moisture.
- Use freshly grated cheese for the best melt and flavor.
- Season each layer lightly; the flavors build up through the dish.
Troubleshooting
Potatoes are still firm after the baking time.
Cover the dish again with foil and continue baking in 5‑10 minute increments until fork‑tender.
The sauce is watery.
Let the gratin rest longer; the sauce will thicken as it cools. If still watery, uncover and bake an extra 5‑10 minutes.
Cheese does not brown.
Increase broiling time by 1‑2 minutes, watching closely to avoid burning.
Storage
Refrigerator: Cover tightly and store up to 4 days.
Freezer: Freeze in an airtight container for up to 2 months; thaw before reheating.
Room temperature: Not recommended; can sit at room temperature for up to 2 hours.
Make-Ahead Tips
- Assemble the gratin up to step 7, cover, and refrigerate up to 24 hours before baking.
- Reheat leftovers in a 350°F oven for 15‑20 minutes until heated through.
Frequently Asked Questions
What is the cultural significance and history of potato gratin in American cuisine?
Potato gratin, often called "scalloped potatoes," became popular in the United States during the early 20th century as a comforting, hearty side dish. It reflects the American love of dairy‑rich casseroles and is a staple at family gatherings and holiday meals.
What are the traditional regional variations of potato gratin in the United States?
In the Northeast, many recipes use sharp cheddar and a breadcrumb topping, while the South often adds a touch of paprika or uses a lighter milk‑based sauce. The West Coast embraces fresh herbs like rosemary and uses mozzarella for a stretchy cheese pull, similar to this recipe.
How is potato gratin traditionally served in American households or holiday meals?
It is typically served hot as a side alongside roasted meats, turkey, or ham. During Thanksgiving and Christmas, it often appears on the buffet table with other casseroles, allowing guests to scoop generous portions.
What occasions or celebrations is potato gratin commonly associated with in American culture?
Potato gratin is a go‑to dish for Thanksgiving, Christmas, Easter brunches, and backyard barbecues. Its rich, comforting flavor also makes it popular for potlucks and family reunions.
How does potato gratin fit into the broader American comfort food tradition?
It embodies the comfort‑food hallmarks of creamy sauces, melted cheese, and simple, pantry‑friendly ingredients. Like mac and cheese or chicken pot pie, it offers warmth and nostalgia on the dinner table.
What are the authentic traditional ingredients for classic American potato gratin versus acceptable substitutes?
Traditional ingredients include thinly sliced potatoes, heavy cream or milk, butter, garlic, and a melting cheese such as cheddar, mozzarella, or Gruyère. Substitutes can be half‑and‑half for a lighter sauce, or a blend of Parmesan and mozzarella for a sharper flavor.
What other American side dishes pair well with this garlic rosemary potato gratin?
It pairs beautifully with roasted green beans, glazed carrots, a crisp garden salad, or a tangy coleslaw. For a full meal, serve alongside roasted chicken, pork chops, or a holiday turkey.
What makes this garlic rosemary potato gratin special or unique compared to other potato gratin recipes in American cuisine?
The addition of fresh rosemary and a generous amount of garlic gives the dish an aromatic depth not always found in classic versions. Using both mozzarella and Romano creates a creamy melt with a subtle salty bite, while the avocado oil adds a higher smoke‑point base for crisp edges.
What are the most common mistakes to avoid when making this garlic rosemary potato gratin?
Common errors include slicing potatoes too thick, which leads to uneven cooking, and under‑seasoning the cream mixture. Also, failing to seal the foil tightly can let steam escape, resulting in a dry top before the final broil.
How do I know when the potato gratin is done cooking and the potatoes are fully tender?
Insert a thin knife or skewer into the center; it should slide in with little resistance. The edges will be golden‑brown, and the sauce should be bubbling but not watery.
What does the YouTube channel Karissa Stevens specialize in?
The YouTube channel Karissa Stevens focuses on approachable home cooking, offering step‑by‑step tutorials for comfort‑food classics, quick weeknight meals, and seasonal dishes. Karissa emphasizes practical tips, ingredient substitutions, and making restaurant‑style flavors accessible to everyday cooks.
Last updated: September 6, 2026
