Preheat the oven to 375 degrees F. Butter a 2-quart baking dish and set aside.
In a large skillet, heat the olive oil over medium-high heat. Add the pancetta and cook, stirring, until golden brown, about 4 minutes. Add the onions and season with salt and pepper and cook, stirring, until the onions begin to caramelize, about 20 minutes. Add the thyme and garlic and cook 1 minute.
Bring a large pot of water to a boil. Add the Swiss chard and blanch until tender, about 3 minutes. Drain and squeeze on towels to remove excess liquid.
Spread a layer of potatoes in the bottom of the prepared dish, slightly overlapping the slices. Season with Essence, and top with a layer of the onions. Place a layer of Swiss chard on top, followed by more potatoes and onions. Repeat with remaining ingredients. Add the cream, top with cheese and cover with foil.
Roast until nearly all the liquid has been absorbed, about 1 hour to 1 hour and 15 minutes. Remove the foil and continue baking until golden brown and bubbly, an additional 15 to 20 minutes.
Remove from the oven and let sit for 10 minutes before serving.
Essence (Emeril's Creole Seasoning):
Combine all ingredients thoroughly and store in an airtight jar or container.
Yield: about 2/3 cup
Recipe from New New Orleans Cooking , by Emeril Lagasse and Jessie Tirsch. Published by William and Morrow, 1993.

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Nutrition Facts

Per Serving Per 100 g

Amount Per 1 Serving
Calories	647.01 Kcal (2709 kJ)
Calories from fat	407.97 Kcal
		% Daily Value*
Total Fat	45.33g	70%
Cholesterol	105.26mg	35%
Sodium	2967.27mg	124%
Potassium	954.83mg	20%
Total Carbs	40.49g	13%
Sugars	9.67g	39%
Dietary Fiber	6.9g	28%
Protein	23.11g	46%
Vitamin C	23.9mg	40%
Vitamin A	0.1mg	3%
Iron	3.7mg	20%
Calcium	378.5mg	38%

Amount Per 100 g
Calories	196.07 Kcal (821 kJ)
Calories from fat	123.63 Kcal
		% Daily Value*
Total Fat	13.74g	70%
Cholesterol	31.9mg	35%
Sodium	899.2mg	124%
Potassium	289.35mg	20%
Total Carbs	12.27g	13%
Sugars	2.93g	39%
Dietary Fiber	2.09g	28%
Protein	7g	46%
Vitamin C	7.2mg	40%
Iron	1.1mg	20%
Calcium	114.7mg	38%

* Percent Daily Values are based on a 2000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.
Find out how many calories should you eat.