Start by making sure your cream cheese is properly softened at room temperature, since cold cream cheese just won't blend right. In a mixing bowl, combine the cream cheese, sour cream, and mayonnaise. Beat it with a hand mixer or whisk it by hand until the mixture turns smooth and creamy with no lumps left behind.
Sprinkle in the ranch seasoning packet, garlic powder, and black pepper, then stir everything together until it's evenly distributed. Fold in a cup of the shredded cheddar along with most of the crumbled bacon, saving a little of each for topping later. This is where the flavor really starts coming together.
Spread the mixture evenly into your greased 9-inch baking dish, smoothing the top with a spatula so it bakes evenly. Sprinkle the remaining cheddar cheese and bacon bits over the top so they get melty and slightly crisp. This little step makes the finished dip look just as good as it tastes.
Place the dish into a preheated 350°F oven and bake for about 18 to 20 minutes. You're looking for the edges to turn golden and the cheese on top to be fully melted and bubbling. Keep an eye on it near the end so the top doesn't brown too quickly.
Pull the dip out of the oven and let it rest for about 5 minutes before serving, since it's extremely hot right out of the oven. Scatter the reserved green onions over the top for a fresh, colorful finish. Serve it warm alongside crackers, chips, or sliced veggies.