Crispy cornbread

Ingredients

• 1 tablespoon (15 grams) unsalted butter, room temperature
• 1-1/2 cups (192 grams) all-purpose flour
• 1 cup (150 grams) cornmeal
• 2 tablespoons (30 grams) granulated sugar
• 1 tablespoon (15 grams) baking powder
• 1 teaspoon (5 grams) salt
• 1 cup (236 milliliters) buttermilk
• 2 eggs
• 1/4 cup (60 grams) mayonnaise
• 1/3 cup (75 grams) unsalted butter, melted
• 3/4 cup (94 grams) grated cheddar cheese
• 1 green onion, thinly sliced