Approximately 20minutes prior to the squash has finished baking, cook the chicken. Cut the chicken to 1" chunks, season with salt and let rest for 5-10minutes.
Heat a tbsp of olive oil and butter in a wide-skillet over medium-high heat. When the butter-sizzles, add the chicken-thighs and cook till well browned on one side for 5-7minutes.
Flip the chicken and cook for another 5-10minutes, till the chicken is cooked-through.
Add the juice of a lemon and cook for approximately 30seconds, scraping up the browned-bits on-the-bottom of the pan.