Preheat the oven to 400 degrees F.
Pierce around the potatoes with a fork and put them on a sheet tray. Drizzle with 2 tablespoons olive oil and season, to taste, with salt and black pepper. Slide them onto the center rack in the oven and bake for 1 hour, then let them cool slightly.
Using a paring knife, slice the potatoes lengthwise and scoop the flesh into a large mixing bowl. Make sure to leave a 1/2-inch thick wall of flesh along the inside of the skin.
In a heavy-bottomed skillet, melt the butter with the remaining tablespoon of olive oil over medium heat. Once warm, saute the garlic and red pepper flakes until fragrant, about 1 minute. Add the Swiss chard leaves and continue sauteing until they are soft and tender and all liquid has been evaporated. Adjust the seasonings with salt and pepper, then transfer the vegetables to a bowl.
Stir the ricotta cheese, mozzarella and Parmesan into the potatoes and season with salt and pepper, to taste. Mash until the filling is creamy, then fold in the Swiss chard.
Using a small spoon, scoop the filling back into the potatoes and pat down the mound so it is secure. Sprinkle more mozzarella and Parmesan over the tops of the potatoes and set them onto a baking sheet. Bake them once more to heat through and to melt the cheese, about 15 to 20 minutes. Remove from the oven and arrange on a serving platter. Serve with softened butter, if desired.

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Nutrition Facts

Per Serving Per 100 g

Amount Per 1 Serving
Calories	644.88 Kcal (2700 kJ)
Calories from fat	144.97 Kcal
		% Daily Value*
Total Fat	16.11g	25%
Cholesterol	20.71mg	7%
Sodium	290.69mg	12%
Potassium	2634.62mg	56%
Total Carbs	100.6g	34%
Sugars	4.95g	20%
Dietary Fiber	9.65g	39%
Protein	23.92g	48%
Vitamin C	41.6mg	69%
Iron	5.1mg	28%
Calcium	352.1mg	35%

Amount Per 100 g
Calories	121.12 Kcal (507 kJ)
Calories from fat	27.23 Kcal
		% Daily Value*
Total Fat	3.03g	25%
Cholesterol	3.89mg	7%
Sodium	54.6mg	12%
Potassium	494.82mg	56%
Total Carbs	18.89g	34%
Sugars	0.93g	20%
Dietary Fiber	1.81g	39%
Protein	4.49g	48%
Vitamin C	7.8mg	69%
Iron	1mg	28%
Calcium	66.1mg	35%

* 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.

Tastes

salty
savory
bitter
sweet

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