Warm 1 tablespoon of the olive oil in a wide, deep skillet set over medium heat.
Add the cubed sweet potatoes to the hot pan. Cook them for approximately 10 minutes, stirring from time to time, until they're golden-brown on some sides and beginning to soften. Transfer to a plate and set aside.
Pour the remaining tablespoon of olive oil into the same skillet.
Introduce the ground beef to the pan. Break it apart and cook for about 8 to 10 minutes, or until browned throughout. If there's excess fat in the pan, drain it off carefully.
Incorporate the diced onion, both bell peppers, and minced garlic into the browned meat. Let everything sauté together for about 5 minutes, or until the vegetables have softened and begun to caramelize slightly.
Return the sautéed sweet potatoes to the pan with the beef and vegetables.
Season the mixture by adding the smoked paprika, cumin, salt, and pepper. Stir well to distribute the spices evenly, and allow it to cook for another 5 minutes so the flavors fully develop.
Scatter freshly chopped parsley across the top just before serving. Serve hot.