In a large bowl, mix together the flour, baking soda, sugar, salt, cinnamon, and nutmeg. Add the butter and cut it in with your fingers or a pastry cutter until crumbly. Add the oats and toss to mix, then stir in ¼ cup of maple syrup.
Spread mixture in a rimmed baking sheet.
Bake at 375° for 20-30 minutes, stirring often, until it becomes brown around edges and they start to look crispy. The granola will finish crisping as it cools.
Mix together walnuts and ½ tablespoon of maple syrup and spread on a parchment lined baking sheet. Bake for 5 to 7 minutes or until golden.
Let walnuts cool, then chop them up and add them, along with the cranberries, to the granola.