Tostadas Paprika Panggang

Bahan-bahan (4 porsi)

• 2 -3 bell peppers
• 1 onion
• 1 teaspoon each cumin, chili powder, smoked sweet paprika
• 1 can black beans
• Garlic
• Tostada shells (3-4)
• Scallions
• Sour cream and salsa