Tortllla Pie (Mary One Perfect Bite)

4 four tortillas (10-inch)
1 tablespoon olive oil, plus more for pan
1 cup chopped onion
1 1/2 teaspoon ground cumin
1/4 teaspoon red pepper flakes
Coarse salt and ground pepper
2 tablespoons tomato paste
1 pound ground beef sirloin
1 tablespoon minced garlic
1 package (10 ounce) frozen corn kernels (shoepeg corn if possible)
1- 6 ounce package fresh baby spinach, torn into pieces
2 cups (8 ounces) shredded Monterey or Pepper Jack cheese
Fresh cilantro sprigs, for garnish (optional)
Sour cream (optional)

1. Preheat oven to 400 degrees.  Using a paring knife, trim tortillas to fit a 9-inch springform pan (use bottom of the pan as a guide).  For some reason my tortillas fit perfectly in the pan without trimming.  Lightly oil bottom and sides of pan.  Set aside.

2. In a large skillet, heat oil over medium heat.  Add onion, cumin, and red pepper flakes; season with salt and pepper.  Cook until onion has softened, 3 to 5 minutes.  Stir in tomato paste.  Raise heat to medium-high; add beef and garlic.  Cook, breaking up meat with a spoon until no longer pink, 4 to 6 minutes.  Add corn and spinach; stir until spinach has wilted, about 2 minutes.

3. Place one tortilla in the prepared pan.  Spreading evenly, top with 1 1/2 packed cups beef mixture, then 1/2 cup cheese.  Repeat with two more layers.  Top with last tortilla, and sprinkle with remaining 1/2 cup cheese.

4.  Bake pie until top is lightly browned, 15 to 20 minutes.  Run knife around edge of pan; remove sides.  Using two wide metal spatulas, lift pie from bottom of pan, and transfer to a cutting board.  Cut into wedges.  If desired, serve with cilantro and sour cream.  Yield 4 to 5 servings.