Place the onions in a microwave safe dish and microwave 2 to 3 minutes.
Add all the ingredients to your slow cooker except the spinach.
Cook on low for 6-7 hours or on high for 3-4 hours.
Add in the spinach leaves and stir.
Cook an additional 15 minutes on high.
Add the ingredients together except the spinach and cook on medium-low heat for 35-40 minutes.
Stir every 10 minutes or so, adding additional broth if you find the liquids reducing by too much.
Add the spinach the last 2 minutes, until wilted.
Add the ingredients together except for the spinach and cook on high pressure for 8 minutes.
Quick release, stir in the spinach and let it sit 2 minutes covered, until wilted.
