Mashed Red Potatoes With Garlic

3 lbs russet potatoes or 3 lbs yukon gold potatoes , peeled and quartered 6 garlic cloves 1 small onion , chopped crushed red pepper flakes 1/4 cup butter ,[...]

2 whole garlic heads 1/4 cup butter , softened 1 tablespoon shallot , finely chopped 2 teaspoons rosemary , finely chopped 2 1/2 lbs red potatoes or 2 1/2 lbs[...]