Preheat your oven to 350°F and spray an 8x8-inch baking dish with cooking spray or brush lightly with olive oil.
Cut your chicken breasts into bite-sized cubes and toss them with garlic powder, onion powder, curry powder, salt, and pepper until evenly coated.
Heat a large skillet over medium heat and cook the seasoned chicken cubes for 5-7 minutes, stirring occasionally, until browned and cooked through. Set aside on a plate.
Bring a pot of water to boil, add the broccoli florets, and cook for about 5 minutes until they're tender but still have a bit of bite. Drain well.
In a large mixing bowl, combine both canned soups, sour cream, milk, and lemon juice, stirring until smooth and well blended.
Add the cooked chicken, blanched broccoli, and 1½ cups of the cheddar cheese to the cream sauce mixture. Stir gently until everything is evenly coated.
Transfer the mixture to your prepared baking dish and spread it out evenly. Top with crushed Ritz crackers, then sprinkle the remaining ½ cup of cheese over everything.
Bake uncovered for 30-35 minutes until the crackers are golden brown and the casserole is hot and bubbly around the edges.
Let the casserole rest for 8-10 minutes before serving to allow it to set up. Serve as is or over rice with a side salad.