Chicken Breast and Rice Casserole

Step 1
Preheat the oven to 350 degrees F (175 degrees C).

Step 2
Bring 2 cups water and white rice to a boil in a saucepan. Reduce heat to medium-low, cover, and simmer until rice is tender and water has been absorbed, 20 to 25 minutes.

Step 3
At the same time, bring remaining 1 cup water and wild rice to a boil in a saucepan. Reduce heat to medium-low, cover, and simmer until rice is tender, 30 to 45 minutes. Drain excess liquid, fluff rice with a fork, and cook uncovered for 5 minutes.

Step 4
Heat oil in a frying pan over medium-high heat. Add mushrooms and onion and saute until soft, 5 to 7 minutes. Set aside in a large bowl and stir in diced chicken, pecans, and sunflower seeds. Stir in cooked rice. Add mayonnaise, sour cream, mustard, salt, and pepper. Transfer to a casserole dish. Spread crushed saltine crackers over top.

Step 5
Bake in the preheated oven for 25 minutes. Spread Cheddar cheese over the casserole and return to the oven until cheese melts, about 5 minutes more. Serve hot.