Soy, linseed and goji berry muffins

Ingredients

• 1/2 cup dried soy beans
• 1 3/4 cup self-raising flour
• 1/3 cup caster sugar
• 2 tablespoon linseeds, plus 1 tbsp extra
• 1/4 cup goji berries, plus 2 tbsp extra
• 125 gram butter, melted, slightly cooled
• 3/4 cup milk
• 2 eggs
• 1 teaspoon vanilla extract