Place the bacon in a cold, medium to large saucepan and set it over medium-high heat.
Cook the bacon until they're crispy, then add the chopped onion.
Once the onion softens, add the green beans, potatoes, savory, salt, pepper, and stock.
Bring your German bean soup to a boil, then lower the heat and simmer until the vegetables are cooked.
Transfer about a third of bohnensuppe from the pan into a bowl.
Use an immersion blender to puree it, then add the sour cream and continue blending.
Place the pureed bean soup back into the pan.
Stir, taste, and adjust seasoning, then reheat for a few minutes, but do not boil.
Remove your bohnensuppe from the heat and transfer it into serving bowls.
Garnish with parsley or more bacon bits, if preferred, then serve.