Everything muffins - chinese grandma

Ingredients

• 1 1/2 cups flour
• 1/3 cup sugar
• 2 teaspoons baking powder
• 1 tablespoon poppy seeds
• 2 teaspoons dried onion flakes
• 1 1/2 teaspoons Diamond Crystal kosher salt (OR 3/4 teaspoon table salt OR 1 teaspoon Morton’s kosher salt)
• 1/3 cup neutral-tasting oil or melted butter
• 1/3 cup milk
• 1 egg