Heat oil in an electric pressure cooker set to Sauté mode. Add bell pepper, onion and garlic; cook, stirring occasionally, until softened, about 3 minutes. Add chili powder and cumin; cook, stirring, until fragrant, about 1 minute. Stir in beans, tomatoes, broth and salt. Close and lock the lid. Cook on high pressure for 10 minutes. Carefully release the pressure manually.