In a medium pot, place sweet potato cubes, almost cover with water, sprinkle with some salt. Cover and boil until fork tender. This should take about 15 minutes. In a small skillet, in 1 tablespoon olive oil saute the onions and peppers. When they’re starting to turn soft, add the tomatoes until everything is soft and cooked. Season with salt and pepper. Drain the boiled sweet potatoes and return to the hot pot. Add the butter, Parmesan cheese and mash until smooth with a potato masher. Transfer mashed sweet potato to a glass baking dish sprayed with canola oil. Spread it evenly. Pour the sauted mixture of onions, peppers and tomato on top of the mashed sweet potatoes. Place in a 350 degree oven for 15 minutes. It’s just for melding the flavors, because everything is basically cooked.
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