
In a large pot over high heat, add the vegetable oil and heat for 1–2 minutes. Add the bison chunks and sear for 2–3 minutes, stirring occasionally, until the meat begins to brown.
Add the chopped onion, shallot, garlic, oregano, tropical Sazón, green chili flakes, and cumin. Cook for 5–8 minutes, until the onion softens and the garlic becomes fragrant.
Pour in the broth and bring to a low simmer. Cover and cook for 90 minutes, stirring occasionally.
While the chili base cooks, prepare the verde sauce. Preheat the oven to broil on high (or 500°F). Arrange the sliced poblanos, jalapeños, and halved tomatillos cut-side down on a baking sheet lined with parchment paper or a silicone mat. Broil for 15–25 minutes, or until the skins are lightly charred and blackened.
Allow the peppers to cool slightly, then remove and discard the skins.
Transfer any liquid from the pan, along with the roasted peppers and tomatillos, to a food processor. Blend until smooth. Add the fresh cilantro and pulse again until fully combined.
Stir the verde sauce into the chili base and reduce to a low simmer. Continue cooking uncovered for 25–30 minutes, until the chili thickens and the meat is tender.
Serve over cooked white rice and top with fresh cilantro as desired
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