Place potatoes into a large pot and cover with salted water; bring to a boil. Reduce heat to medium-low and simmer until tender, about 20 minutes. Drain and transfer to a bowl.
Heat olive oil in a pan over medium heat. Add garlic and cook until light brown and fragrant, 1 to 2 minutes. Remove from the heat and add to potatoes.
Add cream, butter, thyme, rosemary, salt, and pepper to potatoes; beat with an electric mixer until fluffy.
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