Add the peeled and cut potatoes to a large pot and add water just until the potatoes are covered.
Add the sea salt and whole garlic cloves and bring to a boil over high heat.
Once the water begins to boil, reduce the heat to medium-high so the water reaches a simmer. Continue simmering until the potatoes are fork-tender (about 15-20 minutes).
Right before the potatoes are finished cooking, add the butter and the half and half to a microwave-safe bowl and microwave on 50% power until the mixture is warm and the butter is melted.
Drain the potatoes in a colander and rice the potatoes with a potato ricer, adding them back into the pot after you push them through the potato ricer (the pot should be off the heat). If you don't have a potato ricer, use a potato masher and mash gently, just until smooth.
Add the warm butter and cream mixture to the pot with the potatoes, along with the sea salt and pepper. Stir just until everything is combined
Serve immediately while hot. Add a little bit of butter on top with some freshly cracked pepper for serving (and more salt, if desired).