Broccoli Cheddar Soup (Keto)

I made this Broccoli Cheddar Soup tonight, and it was so delicious and comforting.  I made it in my Instant Pot, but I know you could make it on the stovetop or your crockpot.

Ingredients
1 small yellow onion, diced
36oz frozen broccoli florets (can use fresh if you prefer)
6 cups chicken broth
2 cups heavy whipping cream
2 tsp salt
8oz cream cheese
4 cups shredded cheddar cheese

Directions
Put onion, broccoli, chicken broth, and cream cheese into Instant Pot.  Put on high pressure for 15 minutes.  Quick release.  Turn Instant Pot onto saute for about 10 minutes.  Stir in heavy cream, salt, and cheddar, sprinkling a handful at a time and stirring it in good.  I used my whisk and then finished it off with the immersion blender but that's optional.