Preheat oven to 425°. Grease a large sheet pan with nonstick cooking spray and set aside.
In a large bowl combine broccoli, corn, cumin, cayenne pepper, and a heavy pinch of salt. Drizzle with canola oil and toss to coat. Set aside
Place a cast-iron skillet over medium-low heat. In a medium bowl combine chicken, cream cheese, and chipotle peppers plus adobo sauce. Set aside.
Working in batches, heat tortillas on the cast-iron skillet for about 30 seconds per side until warmed. Keep warmed tortilla wrapped in a kitchen towel.
Divide chicken mixture and shredded cheese onto tortillas one at a time, placing filling on one end of the tortilla and rolling up tightly. Place taquitos seem-side-down on one half of the prepared sheet pan and press down gently to keep them sealed.
Spread broccoli mixture onto the remaining space on sheet pan. Transfer to oven and bake for about 20-25 minutes, until tortillas are crisped and browning.
Meanwhile, in a small bowl combine sour cream, zest and juice of lime, cilantro, and a pinch of salt.
Serve taquitos drizzled with sour cream sauce and serve broccoli and corn sprinkled with cotija cheese and pepitas.