Finely chop (see notes) pepper, onion and garlic and add to beef
Sauté for an additional 3-4 minutes or until softened
Whisk together remaining ingredients and mix with ground beef in slow cooker
Cover and cook on high for 2-3 hours or low for 4-6
Notes
Leftovers: Let cool completely, store in air tight containers in fridge up to 3 days/freezer for up to 3 months.
Prep ahead:Brown hamburger, let cool, add all ingredients to freezer bag. Store in fridge up to 3 days/freezer up to 3 months. Thaw fully in fridge overnight before cooking in slow cooker.