Sauté onion in fat (even shmaltz, if you like!) till translucent, 10 minutes or so over medium high heat. It’s okay of some pieces brown; more flavor!

Raise heat a bit, add half the frozen corn, continue sautéing, stirring once or twice, for another five minutes. 

Add some of your chosen liquid and use the immersion blender to puree till smooth(ish); add rest of corn and liquid, seasoning to taste (try a dash of garlic powder or a pinch of sugar). Simmer a few minutes to blend flavors.