– 1 ½ cups all-purpose flour, spooned & leveled – 2 ½ tsp baking powder – 2 tbsp granulated sugar – ¼ tsp salt – 1 large egg – 1 ⅓ cups oat milk (full fat is best), 1 – 3 Tablespoons more if needed* – ½ tsp vanilla extract – 2 tbsp unsalted butter, melted – 1 tsp lemon zest, from about 1 large lemon – ⅔ – 1 cup blueberries, fresh or frozen