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Preheat oven to 450 degrees F. Brush two sheet pans with oil; set aside.
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In small bowl, mix together chia seeds and water; set aside.
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Coarsely grate potato. Using cheesecloth, squeeze out excess liquid. Transfer potato to mixing bowl.
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Peel and grate onion; mix into grated potato.
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Stir in chia seed mixture, salt, pepper, cayenne and cassava flour. Add chopped fresh herbs.
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On sheet pans, arrange golf ball-sized mounds of mixture. Using a spatula, flatten mounds.
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Brush tops of potato pancakes with oil. Bake 15 to 20 minutes, until bottoms are brown and crispy.
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Flip pancakes; brush lightly with oil. Continue cooking 10 to 15 minutes, until browned and crispy.
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Remove pancakes from pan. Serve hot.