Preheat oven to 350.
Melt 1 tbsp in large skillet over medium heat
Add chicken to pan. Sprinkle with salt and pepper on both sides.
Pour lime juice on top of chicken.
Cook the chicken until golden brown and no longer pink in the middle.
Remove from heat. Transfer chicken from skillet to a glass plate or bowl and shred chicken using two forks.
In the same skillet you used to cook the chicken, melt 1/2 tbsp butter. Add onion and jalapeno. Saute until soft (about 7-10 minutes), intermittently adding chicken broth (about 1/4 c) as needed for moisture.
When veggies are soft, add additional 1/4 c chicken broth to skillet. Stir. Add spinach and saute until wilted (about 3-5 minutes).
Add shredded chicken back into skillet. Stir until mixed with veggies.
In a separate bowl, whisk 1/4 c chicken broth with 1/4 c Greek yogurt. After it's well-blended, add the yogurt mixture to the chicken and spinach and stir.
Spoon about 1/3 c chicken mixture down the center of a tortilla. Add a generous pinch of cheese on top of the chicken mixture.
Roll tortilla (like a taco) and place the seam side down in a lightly greased 9x13" pan.
Repeat for remaining 11 tortillas.
In the same skillet you used to prepare the chicken, melt 3 tbsp butter.
Once the butter is completely melted, add 3 tbsp flour and whisk immediately and constantly.
While continuously whisking, slowly add 1 1/2 c chicken broth and continue whisking until all of the lumps of flour dissolve (maybe about a minute).
Add 1/2 c heavy cream and whisk.
Add 1 c plain Greek yogurt and whisk.
Add 2 tsp cumin and chiles (do not drain the can) and stir creamy mixture until well-blended.
Add 3/4 c cheese and stir. Pour cream mixture evenly over wrapped tortillas in the pan.
Sprinkle the top with the remaining cheese.
Bake for 30 minutes.
Remove from oven, allow to cool for a few minutes, and enjoy!