Chop cilantro. Drain and rinse black beans. Chop spinach. Dice red bell pepper.
Combine all ingredients in a bowl. Stir to combine.
Place 1/4 - 1/2 cup of mixture on the lower third of a tortilla. Roll one side in and then roll tortilla as tight as you can.
Place seam side down on a baking sheet.
To freeze: Place entire tray of taquitos in the freezer for 2-3 hours until frozen. Transfer to a freezer safe container and freeze up to 3 months.
To Bake: Preheat oven to 425 degrees F. Spray the tops with cooking spray or lightly brush with oil. Place pan in the oven and bake for 15-20 minutes (add 10 minutes if baking from frozen) until tops start to get golden brown.