Spinach Artichoke Enchiladas

I made these, tonight, for dinner.  My recipe yielded 13 enchiladas.   Two 13x9 pans full.   We ate one pan, and I put the second one in the refrigerator, for tomorrow!
The original recipe calls for making your own enchilada sauce.  I bought a large can, of sauce, from my grocery store.   We like this brand.  The original recipe has the sauce recipe.  Below, is my version:

Enchiladas

• 2 tablespoons olive oil
• 1 cup chopped onion (about 1 small onion)
• ¼ teaspoon salt
• 4 cloves garlic, pressed or minced
• 1 pkg frozen artichokes (defrosted frozen), coarsely chopped
• 1 (4-ounce) can green chilies, drained
• 12 ounces baby spinach
• 1 (15-ounce) can black beans, drained and rinsed
• ¼ cup sour cream
• Freshly ground black pepper, to taste
• 13 (8-inch) whole wheat tortillas
• 1 cup shredded Cheddar cheese
• large can of Enchilada sauce
1. To make your enchiladas, preheat the oven to 400 degrees Fahrenheit with racks in the middle position and upper third. Lightly grease a 13 by 9-inch pan.
2. In a large skillet, warm 2 tablespoons olive oil over medium heat. Once the oil is shimmering, add the chopped onion and ¼ teaspoon salt. Cook, stirring often, until the onion is tender and translucent, about 4 to 5 minutes. Add the garlic and cook, stirring constantly, until fragrant, about 30 seconds.
3. Add the drained artichokes and green chilies to the skillet, then add a few large handfuls of spinach. Cook, stirring and tossing frequently, until the spinach has wilted. Repeat with remaining spinach. Continue cooking, stirring frequently, until the pan is no longer wet with excess moisture. Remove from heat and transfer the mixture to a bowl. Stir in the drained black beans and sour cream. Season to taste with salt and pepper.
4. Pour 1/4 cup enchilada sauce into your prepared pan and tilt it from side to side until the bottom of the pan is evenly coated. To assemble your first enchilada, spread ½ cup spinach artichoke mixture down the middle of a tortilla, then snugly wrap the left side over and then the right, to make a wrap. Place it seam side down against the edge of your pan. Repeat with remaining tortillas and filling. Drizzle the remaining enchilada sauce evenly over the enchiladas, leaving the very ends of the enchiladas bare. Sprinkle shredded cheese evenly over the enchiladas.
5. Bake, uncovered, on the middle rack for 20 minutes. If the cheese on top isn’t golden enough for your liking, carefully transfer the enchiladas to the upper rack of the oven and bake for an additional 3 to 5 minutes, until sufficiently golden and bubbly.
6. Remove from oven and let the enchiladas cool for 10 minutes