Add all chicken ingredients to slow cooker
Cover and cook on high for 3-4 hours or low for 6-8
Shred chicken
Preheat oven to 375
Add a large scoop of shredded cooked chicken (use slotted spoon to drain excess liquid) to center of tortilla (about a cup)
Fold in ends and then tuck one edge and roll as tightly as you can
Brush lightly with canola oil
Bake for about 10-15 minutes or until lightly browned and crispy
Heat butter in saucepan over medium high heat
Whisk in flour until smooth
Slowly whisk in chicken broth and bring to simmer for about 5 minutes while whisking until thickened
Remove from heat and stir in cheese, sour cream and as many of the green chilis as desired
Top crispy burritos with cheese sauce and serve