- Preheat oven to 425°F, and line a baking sheet with foil and set aside.
- Stir together masa and baking powder; then stir in chicken broth, adding a little more broth if dough is too dry. (It should be very moist, but not sticky)
- Quickly shape dough into four circles that are 3-inches wide with a ½-inch rim. Place on baking sheet.
- Spray the dough heavily with nonstick cooking spray. Bake for 30 minutes. Remove pan from oven and spray two or three times more during cooking to make them crisp.
- While sopes are cooking, spray a small skillet with nonstick cooking spray and place over medium-high heat. Add onion and cook for a few minutes, stirring frequently.
- Stir in peppers, tomato, and chorizo and cook for 5 more minutes.
- Spoon a heaping tablespoon of beans onto each sope then top with equal amounts of vegetable mixture. Sprinkle each with a tablespoon of cheese and bake for 5 more minutes.
- Serve immediately.
Makes 4 servings - 1 sope per serving.