Preheat oven to 375 F.
Place sweet potatoes on a rimmed baking sheet and bake for 45 minutes to 1 hour, until easily pierced with a fork.
Reduce oven heat to 350 F and let the potatoes cool, then peel away the skin and mash with butter and sea salt. Mix until smooth.
Brown the onion, peppers, and garlic in olive oil in a large pot over medium heat until wilted and slightly browned, then move to a bowl.
In the same pot over medium heat, add the chorizo and ground beef break up as it cooks. Keep cooking until the meat is browned, about 7-10 minutes.
Add the veggies back to the meat mixture along with seasoning and tomato paste. Mix until fully combined.
Add the meat mixture to a 9x13, or similar sized pan, and spread the sweet potato mixture on top. Bake at 350 for 30 minutes.
Remove from oven, let cool, garnish with cilantro, and serve!