Preheat the oven to 425°F and line a cookie sheet with parchment paper. If you’re making the full recipe, you’ll have four bowls total (or four halves of squash) so you’ll probably need two separate cookie sheets.Wash the spaghetti squash and then slice off the stem at the top (if it is too hard to cut, try cutting a few slices in the squash and microwaving it for 5 minutes to help soften it). Cut each squash in half lengthwise and then use a spoon to scrap out the seeds and the darker yellow strands that the seeds are attached to. Rub a little bit of high heat oil on the inner edges of the squash and then place each half face down on the baking sheet. Roast in the oven for 30-45 minutes, depending on the size (longer for larger squash). You can test to see if it’s done by scraping the inside with a fork. Strands should come loose as you scrape all the way down to the flesh.While the squash is cooking, prepare the filling. In a large pot, warm the olive oil over medium heat. Add the onion and cook for 3 minutes, until translucent. Then add the bell pepper and seasonings (garlic salt to chipotle powder), stir and continue to cook for another 2 minutes.Next pour in both cans of beans, diced tomatoes (with juices), tomato paste and vegetable broth. Stir together, bring to a boil then reduce to a simmer. Continue to cook for 15 minutes.When the squash is done cooking, allow it to cool for a few minutes before handling. Scrape about 3/4 of the inside out onto a dish and then layer the filling inside. Top with the spaghetti squash and press down then add another layer of filling. Finish with desired toppings such as sliced avocado, yogurt, cheese, and fresh cilantro. Serve warm and enjoy!