Make sure your cream cheese is softened. This is the most important step for success. If you forgot to take it out ahead of time, you have two options. Either let it sit on the counter for 20-30 minutes, or microwave it in 15-second intervals until it's soft but not melted. You want cream cheese that's soft enough to easily stir with a spoon, but not so soft that it's broken down or separated.
In a medium mixing bowl, combine the softened cream cheese and the shredded cheddar cheese. Using a whisk, wooden spoon, or even an electric mixer on low speed, blend these together until they're well combined and relatively smooth. You might still see some small lumps of cheese, and that's okay. You're aiming for a creamy base, not perfectly smooth at this point. This should take about a minute or two of mixing.
Sprinkle the Hidden Valley ranch dressing mix over the cheese mixture. Stir it in thoroughly, making sure the seasoning is evenly distributed throughout. You don't want any pockets of dry seasoning. At this point, the mixture should be pretty thick and not very spreadable. This is exactly what you want.
This is the step where you need to pay attention. You're going to add the beer gradually, not all at once. Pour in about 1/4 of the beer (roughly 2-3 tablespoons) and stir it in completely. The dip will start to loosen up. Add another quarter of the beer and stir again. Keep going, adding beer gradually until you reach your desired consistency. By the time you've added all the beer, the dip should be creamy and spreadable, but not soupy. It should hold its shape on a cracker but be smooth enough to dip into. Some people like their dip thicker, some like it looser. By adding the beer gradually, you control exactly how thin or thick it is.
Stir in your chopped green onions. I usually reserve a small handful to sprinkle on top right before serving, but you can mix them all in if you prefer. Taste the dip at this point. Add more salt, pepper, or ranch seasoning if you want. Sometimes I add an extra 1/4 teaspoon of ranch seasoning if I feel like it needs more flavor.
Transfer your beer cheese dip to a serving bowl. Arrange your crackers, pretzels, and vegetables around the bowl, or on a separate plate nearby. If the dip sits for a while and starts to thicken, you can always thin it out again with a splash more beer or even a little milk.
