Mash the pinto beans in a medium bowl with a fork. Stir in 3/4 cup picante sauce and the garlic powder.
Stir the remaining picante sauce, cilantro, black beans and tomato in a medium bowl.
Place 1 tortilla onto a baking sheet. Spread 3/4 cup pinto bean mixture over the tortilla to within 1/2-inch of the edge. Top with 1/4 cup cheese. Top with 1 tortilla and 2/3 cup black bean mixture. Top with 1/4 cup cheese. Repeat the layers twice more. Top with the remaining tortilla and spread with the remaining pinto bean mixture. Cover with aluminum foil.
Bake at 400°F. for 40 minutes or until the filling is hot. Uncover the pie. Top with the remaining cheese. Cut the pie into 6 wedges. Serve with additional picante sauce and sprinkle with additional cilantro, if desired.