Slow-Cooked Mexican Beef Soup

Ingredients

• 1 pound beef stew meat (1-1/4-inch pieces)
• 3/4 pound potatoes (about 2 medium), cut into 3/4-inch cubes
• 2 cups frozen corn (about 10 ounces), thawed
• 2 medium carrots, cut into 1/2-inch slices
• 1 medium onion, chopped
• 2 garlic cloves, minced
• 1-1/2 teaspoons dried oregano
• 1 teaspoon ground cumin
• 1/2 teaspoon salt
• 1/4 teaspoon crushed red pepper flakes
• 2 cups beef stock
• 1 can (10 ounces) diced tomatoes and green chiles, undrained
• Optional: Sour cream and tortilla chips