Slice chorizo and dice green pepper and set aside.
In a large, deep skillet with a lid, heat oil over medium heat. Add Chorizo sausage, and cook until nicely browned on both sides.
Add green pepper, and cook for another 2-3 minutes.
Add the can of fire-roasted diced tomatoes, and stir.
Add rice and spices, and stir to combine.
Add chicken stock, and increase heat to high until mixture is bubbling.
Reduce to low, cover, and cook for 20 minutes.
Remove from heat and let sit for an additional 5 minutes.
Stir to mix all ingredients together. Top with fresh, chopped chives and serve.