Turns out... It was really hard to tell the difference! The biggest thing, besides it of course not tasting EXACTLY like potato, was just the texture being a little more grainy than mashed potatoes. Here's how I made mine!
Cauliflower florets (I used about 2 cups when cutting a head)
2 Tbsp Butter
Salt & Pepper
1/4 C. Ranch or Greek Yogurt (whichever you prefer)
1/4 C. Milk
What I Did:
Boil your Cauliflower, 1 Tbsp butter, and salt for about 10-15 minutes or until VERY tender.
Drain the cauliflower and and place in a mixing bowl with another Tbsp of butter, seasonings, milk, and ranch (or greek yogurt). Beat with a mixer until you reach the desired creamy consistency (add more ranch or yogurt if needed!)
I was very pleased with the kind of healthier substitute! I encourage anyone to try it!