If starting with raw bacon, cook it in a skillet over medium heat until crispy. Let cool completely, then crumble. Set aside.

In a large mixing bowl, combine the Greek yogurt and ranch seasoning. Stir vigorously for about 30 seconds until the seasoning is completely incorporated.

Add the shredded cheddar cheese, crumbled bacon, and chopped green onions to the yogurt mixture. Fold everything together gently but thoroughly.

Cover the bowl tightly with plastic wrap or transfer to an airtight container. Refrigerate for at least 1 hour.

Before serving, give the dip a quick stir. Top with the reserved bacon and green onions. Let sit at room temperature for 10 minutes, then serve with chips, crackers, or fresh vegetables.