Slow Cooker Tex-Mex Black Beans

Ingredients

• 1/4 tsp ground black pepper
• 1 tsp ground cumin
• 1 tsp chili powder
• 2 cloves garlic (finely minced)
• 1 cup chopped onion
• 1/2 tsp salt (or to taste)
• 2 (15-ounce) cans black beans (drained)
• 1 (14.5-ounce) can diced fire-roasted tomatoes (or zesty chili style, with juice)
• 1 (4-ounce) can mild green chile ((4-ounce) chopped)
• 1/2 tsp dried leaf oregano
• 1/4 tsp crushed red pepper (or to taste)
• 1 tbsp chopped cilantro (optional)