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 10 minutes. Drain.
Meanwhile, combine butter, rosemary, sage, thyme, and marjoram in a large microwave-safe bowl. Microwave on high power until melted, about 30 seconds.
Add potatoes to the herb butter mixture. Beat with an electric mixer until almost smooth with a few lumps remaining.
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