Green Tea Muffins

INGREDIENTS

• 1 2/3 cups all-purpose flour
• 1/2 teaspoon salt
• 1 teaspoon baking powder
• 1 tablespoon matcha green tea powder, or to taste
• 1/2 cup white sugar
• 1 egg
• 1/3 cup melted butter
• 1 cup milk
• 1/4 cup chopped walnuts (optional)