Preheat the oven to 350F
Cut squash in half & spoon out seeds, then place on pan and bake for 30 mins
While squash is cooking heat up pan to medium-low and sauté chopped onions & tomatoes with olive oil for 5 minutes
Add ground turkey, cook through, and add desired seasonings (salt & pepper)
Then add white beans, stir, and let simmer until the acorn squash is finished
Pull the acorn squash from the oven and fill each half evenly, top with a tbs. of parmesan cheese on each and put back in the oven for 25-30 mins.