Maple walnut muffins

Ingredients

• 1 1/2 cup plain flour
• 2 teaspoons baking powder
• 1/4 teaspoon salt
• 1/2 teaspoon ground cinnamon
• 120 grams butter, at room temperature
• 3/4 cup sugar
• 2 eggs
• 1/2 teaspoon vanilla extract
• 1/2 cup milk
• 1 cup walnuts, chopped medium-fine
• maple syrup, to drizzle
• 1/2 cup walnuts, toasted and chopped, to garnish
• Maple cream cheese icing
• 100 grams cream cheese
• 30 grams butter, softened
• few drops boiling water
• 1 1/2 - 2 cups icing sugar, sifted
• 1 teaspoon lemon juice