Preheat oven to: 425 degrees (F)
Preheat the oven and line a baking sheet with parchment paper.
Toss the sweet potato cubes with olive oil, salt, and pepper on the sheet. Bake for 30 minutes, stirring halfway through, until roasted. Set aside.
Spray a skillet with cooking spray and set over medium heat. Add the beef and crumble while cooking until no pink remains.
Add the diced onion and peppers; cook 4-5 minutes until tender. Stir in the tomato paste, taco seasoning, and salt.
Divide the beef and roasted sweet potatoes between bowls and serve.