Popcorn Shrimp with Corn Butter

Name: Popcorn Shrimp with Corn Butter
Ingredients: 4 ears of corn—kernels cut off and reserved, cobs reserved; 1/2 onion, quartered; 1 garlic clove, crushed; 6 cups water; 1/2 cup heavy cream; 1 tablespoon cornstarch mixed with 1 tablespoon of water; 3/4 cup plus 2 tablespoons Butter Buds (about 2 1/2 ounces; see Note); Kosher salt; Freshly ground pepper; 1 cup rice flour; 1 large egg; 1/2 cup whole milk; 1 pound shelled and deveined small shrimp; Vegetable oil, for frying; Snipped chives and lime wedges, for serving