Homemade English Muffins with Chive Butter

Name: Homemade English Muffins with Chive Butter
Ingredients: 4 cups (520 grams) bread flour, plus more for dusting and as needed; 3 tablespoons (38 grams) granulated sugar; 2 1/4 teaspoons instant yeast; 2 teaspoons kosher salt; 1 1/2 cups (350 grams) warm whole milk (90 to 100 degrees F); 1/3 cup (80 grams) Greek yogurt (2% or whole); 4 tablespoons (56 grams) unsalted butter, melted, at room temperature; Neutral oil, for the bowl; Medium-coarse cornmeal, for dusting; 1 1/2 sticks (12 tablespoons/170 grams) unsalted butter, at room temperature; 3 tablespoons (8 grams) chopped fresh chives; Zest of 1/2 lemon plus 1 teaspoon juice; 1/4 teaspoon freshly ground black pepper; Flaky salt, for serving