Coat a large stock pot with cooking spray. Over medium-high heat, brown turkey, breaking it into smaller chunks as you cook.
When turkey is browned, add the onion, bell pepper, and garlic. Cook until veggies are slightly softened, about 5 minutes.
Mix chili powder, cumin, and oregano. Add salt and pepper to taste. Cook for a minute, then add in the tomatoes and tomato sauce. Add 1 cup of stock or water.
Bring to a boil, then reduce heat to medium-low and cover. Simmer for about 30 minutes, stirring often. Add more stock or water if the chili gets too thick.
After simmering for 30 minutes, add drained beans to the chili. Cover and continue to simmer for another 10 minutes. Add more stock/water as needed.
Taste the chili and add more salt/pepper as needed.
Leftovers will last in the refrigerator for 4-5 days, or in the freezer for months.