Preheat the oven to 350 degrees F. Lightly grease a 9x13-inch baking dish.
In a large mixing bowl, stir together the softened cream cheese, sour cream, ranch seasoning mix, and shredded cheddar cheese until smooth.
Fold in the thawed hash browns until evenly coated.
Transfer the mixture to the prepared baking dish and spread into an even layer.
Bake uncovered for 40 minutes.
While the casserole bakes, stir together the crushed Ritz crackers and melted butter in a small bowl.
Remove the casserole from the oven and sprinkle the cracker mixture evenly over the top.
Return the casserole to the oven and bake for an additional 20 minutes, or until the topping is golden brown and the casserole is hot and bubbly.
Let the casserole rest for 10 minutes.
Top with the crumbled bacon and sliced green onions before serving.
Christina's Notes
Freshly shredded cheddar cheese melts more smoothly than pre-shredded cheese.
Full-fat sour cream provides the best texture and flavor.
If you'd like additional seasoning, add a pinch of black pepper, garlic powder, or paprika to the filling.
The buttery cracker topping adds a delicious crunchy contrast to the creamy casserole.
Store leftovers in an airtight container in the refrigerator for up to 4 days.
Reheat covered in a 325 degree F oven or in the microwave until warmed through.
This casserole can be assembled up to 24 hours ahead and refrigerated before baking.