Preheat oven to 350°F. Lightly grease a 9x13-inch baking dish.
Whisk soup, sour cream, lemon juice, garlic powder, onion powder, salt, and pepper in a large bowl.
Fold in poppy seeds and chicken until coated. Stir in broth if the mixture seems too thick.
Spread the chicken mixture evenly in the prepared dish.
Combine cracker crumbs, melted butter, and remaining poppy seeds. Toss until evenly moistened.
Scatter the crumb topping over the chicken and bake 25–30 minutes, until bubbly and golden.
Let rest 5 minutes. Garnish with parsley and serve warm, with rice if desired.