For the sauce, whisk the broth, tomato paste and chili powder in a saucepan. Simmer, uncovered, for 5 minutes.
Meanwhile, combine spinach, onions, sour cream and cottage cheese in a bowl; stir in 1 cup shredded cheese. Spoon 1/2 cup of the sauce into a greased 11-in. x 7-in. baking dish. Dip tortillas into the remaining sauce; spoon about 1/4 cup spinach mixture down the center of each tortilla.
Roll up and place, seam side down, in the baking dish. Top with the remaining sauce and cheese. Bake, uncovered, at 350° for 20 minutes or until bubbly. Yield: 6-8 servings.