Add the sour cream, mayonnaise, salt, and seasoned salt. Mix well.
Fold in the parsley and green onions.
Cover and refrigerate the dip for at least 30 minutes before serving.
Recipe Tips
Blender vs. masher: A potato masher gives you a slightly chunky, rustic texture. A food processor or blender gives you a completely smooth, uniform dip that's better suited for use as a salad dressing or sandwich spread. Both methods taste the same; the choice depends on how you plan to serve it.
The 30-minute rest is worth it. The color improves noticeably after the dip sits in the refrigerator, and the flavors meld together more cohesively. If you're pressed for time, you can serve immediately, but the dip tastes better after a short rest.
Browning prevention: The avocado will begin to oxidize and turn brown after a day or two in the fridge. Adding about 1 tablespoon of fresh lemon juice while mixing slows this process significantly. Pressing plastic wrap directly onto the surface of the dip (so no air touches it) also helps extend its vibrant color.
Mashing the avocado first: If you mash the avocado completely before adding the sour cream and mayo, the mixing step becomes much easier. Adding the sour cream to unmashed avocado makes it harder to get a smooth result.