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For the beans, heat olive oil in a medium saucepot over medium-high heat. Once hot, add in onion, cumin, salt and pepper and cook until softened, about 2-3 minutes. Add in chicken stock and black beans and cook until flavors are combined, about 5-7 minutes. Remove from heat and mash the black bean mixture with a potato masher. Cover to keep warm.
In a large skillet, heat olive oil over medium-high heat. Once hot, add in onion, pepper, jalapeño, oregano and season with salt and pepper. Cook for 4-5 minutes or until veggies are softened and beginning to brown. Stir in the tortilla chips and diced tomatoes, and cook about 5-6 minutes to soften. Reduce heat to medium.