1Preheat oven to 375°F (190°C). Grease a 9×9-inch baking dish with olive oil or cooking spray.
2Preheat oven to 375°F (190°C). Grease a 9×9-inch baking dish with olive oil or cooking spray.
3Preheat oven to 375°F (190°C). Grease a 9×9-inch baking dish with olive oil or cooking spray.
4In a large skillet, heat olive oil over medium heat. Add the diced onion and minced garlic, and sauté for 2-3 minutes, or until fragrant. Add the ground beef and cook, breaking it apart, until browned and cooked through. Drain excess fat if needed.
5In a large skillet, heat olive oil over medium heat. Add the diced onion and minced garlic, and sauté for 2-3 minutes, or until fragrant. Add the ground beef and cook, breaking it apart, until browned and cooked through. Drain excess fat if needed.
6In a large skillet, heat olive oil over medium heat. Add the diced onion and minced garlic, and sauté for 2-3 minutes, or until fragrant. Add the ground beef and cook, breaking it apart, until browned and cooked through. Drain excess fat if needed.
7Stir in the taco seasoning and 1/4 cup water. Let the mixture simmer for 2-3 minutes until fully combined.
8Stir in the taco seasoning and 1/4 cup water. Let the mixture simmer for 2-3 minutes until fully combined.
9Stir in the taco seasoning and 1/4 cup water. Let the mixture simmer for 2-3 minutes until fully combined.
10Spread the cooked beef mixture evenly in the bottom of the prepared baking dish.
11Spread the cooked beef mixture evenly in the bottom of the prepared baking dish.
12Spread the cooked beef mixture evenly in the bottom of the prepared baking dish.
13Spoon sour cream over the beef layer and spread it out gently. Top with diced tomatoes, bell peppers, black olives (if using), and green onions.
14Spoon sour cream over the beef layer and spread it out gently. Top with diced tomatoes, bell peppers, black olives (if using), and green onions.
15Spoon sour cream over the beef layer and spread it out gently. Top with diced tomatoes, bell peppers, black olives (if using), and green onions.
16Sprinkle the shredded cheddar cheese evenly over the top of the casserole.
17Sprinkle the shredded cheddar cheese evenly over the top of the casserole.
18Sprinkle the shredded cheddar cheese evenly over the top of the casserole.
19Bake for 15-20 minutes or until the cheese is melted and bubbly.
20Bake for 15-20 minutes or until the cheese is melted and bubbly.
21Bake for 15-20 minutes or until the cheese is melted and bubbly.
22Remove from the oven, sprinkle with fresh cilantro if desired, and serve hot.
23Remove from the oven, sprinkle with fresh cilantro if desired, and serve hot.
24Remove from the oven, sprinkle with fresh cilantro if desired, and serve hot.