Red Red Mushroom Rotini

Name: Red Red Mushroom Rotini
Ingredients: ½ large red onion; ½ cup diced red cabbage; 1 ½ cups diced button mushrooms; 1 diced roman tomato; 1 pinch red pepper flakes; ¼ cup pumpkin seeds (cooked); ½ cup dried cranberries; 1 Tbsp roasted garlic (from jar); Pinch of kosher salt; 2 Tbsp butter; 1 cup store brand spaghetti sauce (mushroom & onion); 1 box (13.25oz size) whole wheat rotini pasta; 1 ½ cup of ricotta cheese