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Preheat the oven to 350°F (180°C).
While the oven warms up, chop off the heads of the garlic bulbs, spread the cloves out on some foil, drizzle in olive oil, and wrap them in the foil.
Place the foil wrapped garlic in a pan, and place them in the oven to cook for about 90 minutes.
Give them some time to cool once they're done.
Next, mix 2 tablespoons of olive oil and 2 tablespoons of butter in a soup pot, over medium heat.
Place the diced red onion in the mixture, cook for 10 minutes, stirring frequently.
Now that the garlic has cooled down, grind it, and mix it together with the stewed red onion.
Mix well, add the fresh thyme and other herbs.
Lower the temperature and mix in the bread crumbs/cubes.
Cook for about 5 minutes or until the bread softens.
Remove the fresh herbs from the mixture and place in a blender or food processor until it becomes a semi-creamy mixture.
Place the soup back into the pot, add in the sour cream, and feel free to add salt or pepper according to your taste preferences!
Enjoy!