Burger with quinoa and sweet potato

Ingredients

• 1 big sweet potato
• 2 cups boiled quinoa (preferably red)
• 1 small onion
• 1 egg
• 1/2 teaspoon salt
• 1 teaspoon paprika
• 1/2 teaspoon garlic powder
• 1/2 teaspoon cumin
• 1/3 cup crumbled sunflower seeds
• 2 tablespoons olive oil
• 2 tablespoons milk
• 1/2 cup crushed oat
• 250g multigrain flour
• 300g white flour
• 1 bag yeast
• 300g water
• 1 teaspoon sugar
• 1 teaspoon salt