Creamy and comforting soup made with fresh mushrooms, onions, and thyme.
Unlike thin clear broths that rely solely on simmering time for depth, blended soups depend entirely on mechanical reduction and starch suspension. When pureeing the cooked mushrooms, onions, and broth in a blender or food processor, pulse the machine rather than running it continuously. Stopping before the mixture becomes entirely uniform preserves distinct vegetable bits that provide necessary texture. Leaving those microscopic chunks intact prevents the finished bowl from feeling heavy or monotonous on the palate.
Separating the initial vegetable simmer from the butter and flour base eliminates the risk of scorching dairy over direct heat. Whisking all-purpose flour into melted butter creates a thick paste that requires cooking for at least one minute to eliminate raw starch flavors. Incorporating half-and-half gradually while stirring constantly prevents lumping. Bringing the liquid to a boil activates the flour starches fully, yielding a glossy finish that holds body without separating.