Name: Cheesy Scalloped Potatoes with Thyme
Prep time: 25 min
Cook time: 70 min
Total time: 95 min
Ingredients: 3 lbs Russet potatoes (about 4 large, peeled); 3 tbsp unsalted butter; 3 cloves garlic (minced); 3 tbsp all-purpose flour; 2 cups heavy cream; 1 cup whole milk; 2 tsp fresh thyme leaves (from about 6 sprigs, or 3/4 tsp dried); 1 1/2 tsp kosher salt; 1/2 tsp black pepper (freshly ground); 2 1/2 cups sharp cheddar cheese (freshly shredded, divided); 1 tbsp fresh thyme sprigs (for garnish, optional)

From the roundup: 12 Easy Thanksgiving Side Dish Recipes Everyone Will Ask About

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Cheesy scalloped potatoes are the one Thanksgiving side I actually make ahead without stressing about it. Twenty-five minutes of active work the morning of, then it goes in the fridge unbaked until about an hour before dinner. While everything else is fighting for oven space, this dish is mostly doing its own thing at 375 degrees.

The sauce is a simple roux with heavy cream, whole milk, garlic, and fresh thyme. One cup of sharp cheddar goes right into the sauce, and the rest gets layered in and piled on top. I use a mandoline for the slicing because the one time I tried a knife, the layers were uneven and the thinner slices turned to mush before the thick ones were done.

It takes about 70 minutes total in the oven, 45 covered and then another 20 to 25 uncovered to get that deep golden top. Let it sit for 10 minutes before you serve it or the sauce runs everywhere on the plate.

Why you will love this

The roux-based sauce holds together when you scoop it, no watery puddle on the plate.
You can assemble the whole dish the night before or the morning of and refrigerate it unbaked.
Every layer gets sauce and cheese, so the potatoes taste seasoned all the way through.
Leftovers reheat well, covered in a 350-degree oven for 20 minutes, and the texture stays creamy.
Fresh thyme gives the sauce a specific savory note that dried herbs alone do not quite match.

Tips for success

Slice the potatoes at 1/8 inch and keep the thickness consistent. A mandoline is the most reliable way to do this. Uneven slices mean some layers are overdone before others are tender.
Pat the potato slices completely dry after draining them. Wet potatoes water down the sauce during baking and you end up with a thinner, looser result.
Whisk the cream and milk in slowly and keep whisking until the sauce is thick enough to coat a spoon before you pull it off the heat. If it goes into the dish too thin, the layers will not hold.
If the cheese on top is browning fast but a knife still meets resistance in the center, lay the foil back on loosely for the last 10 minutes rather than pulling the dish early.

If the potatoes aren’t done in time

Test for doneness with a sharp knife or thin fork through the center of the dish, not just the edge. The edges always cook first.
If the top is set and golden but the center still has resistance, cover loosely with foil and give it another 10 to 15 minutes.
Ovens vary. If yours runs cool, the covered bake may need closer to 50 minutes before you pull the foil.
Skipping the 10-minute rest after baking is the most common reason portions fall apart when served.

Substitutions

Yukon Gold potatoes work in place of Russets and give a slightly creamier, less starchy layer. Gruyere or Fontina can replace the sharp cheddar if you want a milder, nuttier flavor. Dried thyme substitutes at 3/4 teaspoon for the 2 teaspoons of fresh called for in the recipe.

For a lighter sauce, swap half the heavy cream for additional whole milk. The sauce will be a bit thinner and may take a few extra minutes to set up in the oven. I would not go further than that or the layers tend to separate.

Make-ahead and storage

Assemble the dish completely through the final layer of cheese, cover it tightly with foil, and refrigerate for up to 24 hours before baking. Pull it out while the oven preheats and add about 10 minutes to the covered baking time since it is starting cold. This is genuinely the move for Thanksgiving because it frees up the morning.

Leftovers keep in the fridge, covered, for up to four days. Reheat individual portions in the microwave covered with a damp paper towel, or rewarm the whole dish at 350 degrees covered with foil for about 20 minutes. Freezing is possible but the texture softens noticeably after thawing, so I only do it if I have no other option.

Brittany Stage