Step 1

Pre-heat oven to 400 degrees F.  On a large baking sheet, toss together the cubed butternut squash, olive oil, spices, salt and pepper.  Bake butternut squash until tender and starting to caramelize, about 40 minutes.

Step 2

Lay tostadas out on the baking sheet and spread with a scant 1/4 cup refried beans, heaping 1/4 cup roasted butternut squash and 1-2 tablespoons cheese.  Bake tostadas until cheese is melted, 7-10 minutes.  If using vegan cheese you may have to turn on the broiler for a minute.

Step 3

Make the sauce while tostadas are baking: add all ingredients to a blender, or food processor, and blend until creamy.

Step 4

Garnish tostadas with fresh cilantro and top with desired amount of avocado lime sauce.