Roasted Butternut Squash Tacos with Caramelized Onions & Parmesan Recipe

(2 1/2 – 3 pound) butternut squash, peeled & cubed 2 tsp. olive oil 1/2 tsp. salt 1/2 tsp. pepper 2 tsp. olive oil 1 medium yellow onion, thinly sliced 1 clove garlic, minced 1/4 tsp. salt 1/2 tsp. dried sage Flour tortillas Freshly grated parmesan cheese