This is a simple, one-pot meal that’s easy on the waist and flavorful at the same time. Try this with chicken as well.
Coat a large nonstick skillet with cooking spray and set over medium heat.
Sprinkle the pork with ¼ teaspoon each of salt and pepper. Add the pork to the skillet, increase the heat to medium-high and cook, turning the pieces occasionally, until browned, about 6 minutes. Remove to a plate.
Off the heat, coat same skillet with cooking spray and set over medium heat. Add the potatoes, onion, and ½ cup of water. Cook for 1 minute, scraping the bottom of the pan. Cover and cook for 5 minutes, stirring occasionally.
Add yellow pepper, mushrooms, rosemary, and the remaining salt and pepper to the skillet. Sauté over medium-high heat, until the vegetables are lightly browned, adding 1-2 tablespoons of water if needed to prevent sticking, about 7 minutes.
Stir in the marinara sauce, pork, and ¼ cup of water, and bring to a simmer. Cover the skillet, reduce the heat to medium and cook until vegetables are tender and pork is cooked through, about 7 minutes. Serve.