Cut each tortilla into 8 wedges and place in a resealable plastic bag. Spray tortillas with cooking spray and sprinkle with chili powder; seal and shake bag to coat tortilla wedges. Place on large baking sheet and bake in preheated 400°F ( 200°C) oven for about 8 minutes or until golden and crisp. Let cool completely before using.
In a food processor bowl, puree beans, salsa, lime rind and juice, shallot, cumin and pepper until smooth. Scrape into bowl and stir in cilantro and basil, if using.
Serve with tortilla chips.