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Preheat oven to 375 degrees F. Fill muffin tin wells with paper baking cups.
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In medium bowl, mix together oat milk, chia seeds, vanilla extract, blueberry jam and maple syrup; let sit 20 minutes.
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In a separate bowl, whisk together oats, baking powder, cinnamon, nutmeg and salt.
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In small bowl, prepare crumble topping. Combine oats, chopped walnuts, gluten-free flour mix, coconut oil, coconut sugar and cinnamon. Set aside.
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Pour wet mixture into dry mixture and stir to combine. Fold in blueberries.
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Divide batter evenly into muffin tin. Top each with crumble topping, dividing evenly.
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Bake 30-35 minutes until filling is set. Cool slightly before serving.