1. Preheat your oven to 375°F (190°C). Lightly grease a 9×13-inch baking dish to keep your casserole from sticking.
2. In a large skillet, heat olive oil or butter over medium heat. Add the chopped onion and garlic and sauté until fragrant and translucent, about 3-4 minutes.
3. In a large mixing bowl, combine the uncooked rice, chicken broth, sour cream, ranch seasoning, cooked chicken, thawed peas and carrots, and sautéed onions and garlic. Stir well to combine.
4. Pour the mixture evenly into the prepared baking dish. Cover tightly with aluminum foil to trap steam and help the rice cook evenly.
5. Bake in the preheated oven for 40-45 minutes, or until the rice is tender and has absorbed most of the liquid. You’ll know it’s done when you can easily poke a fork through the rice without resistance.
6. Remove the casserole from the oven, carefully uncover, and sprinkle the shredded cheddar cheese evenly over the top.
7. Return the casserole to the oven, uncovered, and bake for an additional 10 minutes, or until the cheese is melted and bubbly.
8. If you like, sprinkle crispy fried onions on top for added crunch just before serving.
9. Let the casserole rest for about 5 minutes before serving. This helps everything set and makes it easier to scoop onto plates.

One of my favorite moments in cooking has always been that final step—when you pull the casserole out of the oven and the whole kitchen fills with that incredible aroma. It’s like a little victory, a reminder that even on the busiest days, you can create something beautiful and nourishing. I often find my kids hovering nearby, impatient but excited to dig in. And honestly, it’s those moments that make the time spent cooking feel so worthwhile.