They will be lightly browned and tender. Strain and keep both to the side. Next, add the cream and sticks of butter to a separate small sauce pot and keep warm over low heat.
Add the potatoes to a large pot of salted boiling water along with the 10-12 garlic cloves and cook over medium-high heat to a low boil for 10-12 minutes.
Strain the potatoes and transfer them with the roasted garlic cloves to a food mill, stand mixer, hand mixer, or hand masher. Mash the potatoes until smooth.
Fold in the hot cream and butter, ½ cup to ¾ cup of roasted garlic olive oil, sour cream, salt, and pepper using a rubber spatula to combine completely.