Heat oil in the same pan over medium-high heat.
Add garlic. Sauté, stirring, for one minute or until fragrant. Add red bell peppers (capsicum) and jalapeño. Sauté, stirring occasionally, for 2 minutes or until the vegetables are tender.
Add cumin, paprika, oregano and chili flakes. Sauté, stirring, for one minute or until fragrant. Add canned tomatoes and 1 cup water.
Bring to a boil. Reduce heat and simmer for 5 minutes.
Add meatballs back into the sauce. Simmer, covered, for 15 minutes or until the meatballs are cooked through.
Serve meatballs with tortillas, guacamole and sour cream.