Cut butternut squash in half length-wise. Remove seeds. Brush flesh of butternut squash with oil. Roast 1/2 butternut squash skin side up in a 400 degree oven for 1 hour. Afterward, allow to cool and remove squash from the skin. Set aside.
Roasted Poblano Pepper
Preheat oven to 400 degrees. Place poblano peppers on a baking sheet. Roast poblano chiles for minutes. Then placed peppers in a covered bowl to allow the skins to steam for easy removal.
When peppers have cooled, make a vertical cut on the top of each pepper from the stem to the tip. Do not cut through because you will need the peppers whole to stuff them. Remove skin and seeds. Set aside.
Steamed Red Quinoa
Place quinoa and water in a covered saucepan. Bring water to a boil, then set to low and allow to simmer for 10-15 minutes with lid on. Allow quinoa to become tender and for excess water to evaporate. Set cooked quinoa aside.
Picadillo Filling
Heat a large skillet on high. Add in ground beef and sprinkle salt on top of beef. Brown beef for 5 minutes. Then add in diced onion, tomato paste, garlic, cumin, adobo/taco seasoning, and salt. Saute another 5 minutes, stirring occasionally.
Then add roasted butternut squash, cooked red quinoa, salt, and shredded Monterey Jack cheese. Taste for seasoning and add salt, taco seasoning, and cumin as needed.
Stuffing the Peppers
Add 1/4 of the butternut squash filling mix into each roasted pepper. Top with crumbled queso fresco and serve warm.