To make chili oil, in heatproof bowl, combine 1 Tbsp red pepper flakes, cinnamon stick, scallion, garlic, coriander, and salt.
In small saucepan, heat grapeseed oil over medium until hot enough for a few red pepper flakes to sizzle when added. Pour oil over the heatproof bowl with spices. Let stand until cooled completely, about 1 hour. Strain out spices with fine-mesh sieve.
To make migas, in bowl, whisk eggs with salt and pepper.
Lower heat to medium-low and slowly pour in whisked eggs, pushing eggs around pan frequently until barely set. Gently stir in tortilla chips. Sprinkle on cilantro.
To serve, divide egg mixture, refried beans, and avocado among serving plates. Drizzle on chili oil, to taste. Refrigerate leftover chili oil for later use.