In a large bowl, combine the chicken strips, cream cheese, chopped jalapeƱos, garlic powder, salt, pepper, and cumin. Mix until evenly combined (soften the cream cheese first if needed).
Divide the chicken mixture into three equal portions.
Spread one portion evenly across the bottom of the slow cooker. Sprinkle 1/3 cup of the shredded Mexican blend cheese over the chicken.
Tear three of the 6-inch tortillas into pieces and arrange them in a single overlapping layer over the cheese so the bottom is covered.
Spread the second portion of the chicken mixture evenly over the tortilla layer. Sprinkle another 1/3 cup shredded cheese on top, then tear and arrange the remaining three tortillas into a single layer over that cheese.
Spread the final portion of the chicken mixture evenly over the top tortilla layer. Sprinkle the remaining 1/3 cup shredded cheese over the top.
Cover and cook on low for 4 to 6 hours or on high for 2 to 3 hours, until the chicken is cooked through.
Turn off the slow cooker, let the pie rest about 5 minutes, then slice or scoop and serve.