FOR MUFFINS

• 3 C all-purpose flour
• 1 C sugar
• 2 tbsp poppy seeds
• 1 tbsp baking powder
• 1/2 tsp baking soda
• 1/2 tsp salt
• 1 1/2 C plain whole milk yogurt or low-fat yogurt
• 2 tbsp fresh lemon juice, optional
• 1 1/2 tbsp grated lemon zest
• 2 large eggs
• 8 tbsp unsalted butter, melted and cooled

FOR THE GLAZE

• 1/4 C sugar
• 1/4 C lemon juice
• coarse sugar for sprinkling, optional