In a big pan melt butter over medium/high heat and add sliced onions and stir and cook for 10 minutes
Add chicken broth and cook for 5 minutes
Add olive oil and garlic to the pan and cook for 5 minutes
Add spinach to the pan and cook and stir for approximately 10 minutes
Video
Notes
This dish is more of a lightly caramelized onion, but if you want really caramelized do steps 1-3 but for much longer until the onions turn a golden color
Do use fresh spinach. Frozen spinach will be so full of water when defrosted it will not taste the same
I prefer baby spinach due to the size of the leaves, but if you use regular spinach just chop it up a bit
I prefer sweet onions for this dish because it brings a little sweetness to that semi bitter spinach taste
If needing to double the recipe for more servings I suggest cooking all the onions like steps 1-3 then remove half of the onions and follow the recipe as directed. After that is cooked follow the rest of the recipe with the other half of onions. Once all cooked add it all together to give even temperature. Unless you have a super huge pan to do it all at once.