Mini Potato Gratin Stacks

The Base

• 3 lbs (1.35 kg) Yukon Gold Potatoes: Medium-sized, uniformly shaped potatoes work best so they fit neatly inside standard muffin cup wells.
• 2 tbsp Unsalted Butter: Melted, for brushing the muffin tin wells generously.

The Herb & Garlic Cream

• 1 cup Heavy Cream (36% fat Content): Provides the necessary richness and structural body.
• 1/2 cup Whole Milk: Keeps the liquid mixture light enough to absorb deep into the stack.
• 3 cloves Fresh Garlic: Finely minced or grated using a microplane.
• 1 tbsp Fresh Thyme Leaves: Stripped from stems and finely chopped (plus extra sprigs for garnish).
• 1 tsp Fresh Rosemary: Very finely chopped.
• 1 tsp Kosher Salt: Adjust to taste.
• 1/2 tsp Freshly Cracked Black Pepper:
• 1/4 tsp Ground Nutmeg: The secret aromatic element essential to authentic French potato gratins.

The Cheese Blend

• 1 cup Gruyère Cheese: Freshly shredded (substitute with sharp Swiss or Emmental).
• 1/2 cup Parmesan Cheese: Freshly grated (provides salty, nutty caramelization for the crust).

Kitchen Tools Needed

• Standard 12-Cup Muffin Tin: Non-stick or well-seasoned aluminum.
• Mandoline Slicer: Essential for uniform $1/16$-inch ($1.5\text{ mm}$) thin slices.
• Large Mixing Bowl & Whisk: For blending the seasoned cream mixture.
• Pastry Brush: To grease the muffin wells thoroughly.
• Aluminum Foil: To cover the stacks during the initial baking phase.

Step-by-Step Instructions

1.Prep Equipment & Preheat Oven:Setting up for optimal crisping.

Preheat your oven to 375°F (190°C) with a rack positioned in the center. Lightly brush all 12 wells of a standard muffin tin with melted butter. Ensure you coat the sides thoroughly so the stacks release easily after baking.

2.Prepare the Cream Infusion:Building maximum flavor foundation.

In a bowl or liquid measuring cup, combine the heavy cream, whole milk, minced garlic, chopped thyme, chopped rosemary, kosher salt, black pepper, and ground nutmeg. Whisk vigorously until the salt is completely dissolved and herbs are evenly distributed.

3.Slice the Potatoes Thinly:Precision technique for tender layers.

Wash and peel the Yukon Gold potatoes. Using a mandoline set to approximately 1/16-inch (1.5 mm) thickness, slice all potatoes into uniform rounds. Do not rinse or submerge the sliced potatoes in water, as you need their natural surface starch to bind the gratin layers together.

4.Toss and Coat:Ensuring every layer is seasoned.

Transfer the potato slices into a large mixing bowl. Pour the herb-infused cream mixture over the slices along with half of the shredded Gruyère and half of the Parmesan. Gently toss the potatoes with your hands or a spatula, separating any slices stuck together, ensuring every slice is fully coated in cream and cheese.

5.Build the Stacks:Layering for structural integrity.

Layer the coated potato slices directly into the prepared muffin wells, stacking them neatly flat on top of each other. Build each stack slightly above the rim of the muffin cup (about 1/2 inch higher), as they will condense significantly as they bake down. Pour any remaining garlic cream from the bottom of the bowl evenly over the top of the 12 stacks.

6.Initial Covered Bake:Steaming to tender perfection.

Cover the muffin tin tightly with a sheet of heavy-duty aluminum foil. Place the muffin tin on top of a rimmed baking sheet (to catch any potential liquid drips). Bake covered at 375°F (190°C) for 30 minutes until the potatoes are tender when pierced with a paring knife.

7.Cheese Top & Crisp:Creating the golden crispy crown.

Carefully remove the foil cover. Sprinkle the remaining Gruyère and Parmesan cheese evenly across the top of each stack. Return the uncovered tin to the oven and bake for an additional 15 to 20 minutes, until the tops are deeply golden, bubbly, and the outer edges are deliciously crisp.

8.Rest & Unmold:Setting the structure before serving.

Remove from the oven and let the stacks rest in the muffin tin for 10 minutes. This cooling period allows the melted starch and cheese to set, preventing the stacks from collapsing upon removal. Run a butter knife around the edge of each well, gently lift out using two forks or a spoon, and garnish with fresh thyme sprigs.

Chef’s Secrets for Success

• Why Yukon Gold? Yukon Golds strike the ideal balance between starch content and buttery flavor. Russet potatoes can turn overly mealy, while red potatoes lack sufficient starch to hold the stack together cleanly.
• Keep the Starch intact: Never submerge sliced potatoes in water for this recipe. Starch acts as the natural glue that locks the cream and potato layers into a solid stack.
• Even Thickness Matters: A mandoline guarantees uniform cooking. Slices that are too thick will remain tough, while uneven slices bake at different rates.

Make-Ahead, Storage & Reheating Instructions

• Make-Ahead: You can assemble the raw stacks in the muffin tin up to 6 hours ahead. Cover tightly with plastic wrap and chill in the refrigerator. Bring to room temperature 20 minutes before baking.
• Refrigeration: Store leftover baked stacks in an airtight container in the refrigerator for up to 4 days.
• Reheating for Maximum Crispiness: Place stacks on a parchment-lined baking sheet and heat in a 350°F (175°C) oven or air fryer for 8–10 minutes until heated through and crisp on the outside. Avoid microwave reheating as it makes the potato layers soggy.