Chickpea Omelette Sandwich

Ingredients

• 1 Tbsp ground flaxseeds
• 3 Tbsp water
• ½ cup chickpea flour
• ½ cup unsweetened soy milk
• 1 Tbsp nutritional yeast flakes
• ¼ tsp onion powder
• ¼ tsp garlic powder
• ¼ tsp kala namak
• ¼ tsp salt
• ⅛ tsp ground black pepper
• ½ red bell pepper
• 1 small red onion
• 1 Tbsp olive oil
• 6 slices whole wheat bread
• 3 Tbsp vegan mayonnaise
• 1 cup romaine lettuce
• 1 medium tomato
• 1 avocado