First, cook the cauliflower rice according to package instructions. Place the frozen cauliflower rice in a microwave-safe bowl, cover it loosely, and microwave based on the timing listed on the package. Then, once cooked, carefully drain any excess liquid. This step is important because excess moisture can make the casserole watery. After draining, spread the cauliflower rice on a plate or tray to allow steam to escape. Let it cool slightly while you prepare the beef.

Meanwhile, prepare the ground beef. If using baking soda, sprinkle it evenly over the raw beef and gently mix it in. Then, let the beef rest for about 15 minutes. This allows the baking soda to tenderize the meat and helps it stay juicy during cooking. After resting, heat a large skillet over medium-high heat. Once the skillet is hot, add the ground beef. Break it apart immediately using a spatula or wooden spoon.

Next, season the beef with garlic powder, onion powder, Italian seasoning, and black pepper. Continue cooking while breaking the meat into small, even crumbles. Stir frequently to ensure even browning. Cook the beef until fully browned and no pink remains, which usually takes about 8 to 10 minutes. Then, carefully drain any excess grease if necessary. Transfer the cooked beef evenly into a 13x9-inch baking dish. Spread it out so it forms a consistent base layer.

After that, prepare the tomato sauce. Heat olive oil in a medium saucepan over medium heat. Once the oil is warm, add the chopped onion and green bell pepper. Stir frequently as they cook. After about 5 minutes, the vegetables should soften and begin to turn slightly translucent. Then, add the minced garlic and cook for another 30 seconds, stirring constantly to prevent burning.

Next, pour in the crushed tomatoes. Then, add garlic powder, onion powder, Worcestershire sauce, salt, black pepper, and red pepper flakes. Stir thoroughly so all ingredients combine evenly. Reduce the heat to medium-low and allow the sauce to simmer gently for 8 to 10 minutes. This step helps deepen the flavor and slightly thickens the sauce. Once done, remove from heat.

Now, assemble the casserole. First, ensure the cooked beef is evenly spread in the baking dish. Then, carefully spread the cauliflower rice evenly over the beef layer. Press it down gently to create a uniform surface. Next, pour the prepared tomato sauce over the cauliflower rice. Use a spoon or spatula to spread it evenly, making sure every area is covered.

After that, sprinkle the shredded cheddar cheese evenly across the entire surface. Make sure the cheese covers all areas so it melts into a consistent golden layer during baking.

Then, preheat your oven to 350°F (175°C). Place the baking dish on the center rack of the oven. Bake uncovered for 35 to 45 minutes. During baking, the cheese will melt and begin to lightly brown around the edges. The sauce will bubble gently, and the casserole will set properly.

Finally, remove the casserole from the oven and allow it to rest for 10 minutes. This resting time helps the layers settle and makes serving easier. Before serving, sprinkle freshly chopped parsley evenly over the top. Serve warm.