Instant Pot - Add oil to insert and set on Saute setting. Once hot, add onion and pepper. Cook, stirring occasionally, until softened, about 2 to 3 minutes.
Add beef and cook until browned, about 4 to 5 minutes. Turn off Instant Pot.
Add remaining ingredients, stirring to combine. Cook on High pressure for 20 minutes. Manually release pressure. Serve warm with your favorite toppings.
Stovetop - Add oil to a Dutch oven and heat over medium-high heat. Once hot, add onion and pepper. Cook, stirring occasionally, until softened, about 2 to 3 minutes.
Add beef and cook until browned, about 4 to 5 minutes.
Add remaining ingredients, stirring to combine. Bring the chili to a simmer and cook for about 30 to 45 minutes, stirring occasionally. Serve warm with your favorite toppings.
Slow Cooker - Add oil to a medium skillet and place over medium-high heat. Once hot, add onion and pepper. Cook, stirring occasionally, until softened, about 2 to 3 minutes.
Add beef and cook until browned, about 4 to 5 minutes. Remove from heat and add to slow cooker insert.
Add remaining ingredients, stirring to combine. Cook on High for 4 hours. Serve warm with your favorite toppings.