Cinnamon Oat Pancakes

Name: Cinnamon Oat Pancakes
Ingredients: 2 tablespoons unsalted butter, plus more for cooking and serving; 1 1/4 cups (162 grams) all-purpose flour; 2 tablespoons sugar; 1/2 teaspoons cinnamon; 1 teaspoon baking powder; 1/2 teaspoon baking soda; 1/4 teaspoon kosher salt; 1 1/2 cups (375 milliliters) milk, dairy or oat (see Cook’s Note); 2 teaspoons lemon juice; 1 egg; 1/2 teaspoon vanilla extract; 1/2 cup (125 milliliters) spent oats from Maple Oat Milk, recipe follows; Canola oil, for cooking; Maple syrup, for serving; 1/2 cup rolled oats; 2 1/2 cups cold water; 2 to 4 tablespoons maple syrup; 1 1/2 teaspoons vanilla extract; 1/8 teaspoon kosher salt