Heat oven to 375°F. Spray 24 mini muffin cups with cooking spray. Make spinach as directed on box.
2If using dough sheet: Unroll dough on work surface. Press into 12x8-inch rectangle. If using crescent rolls: Unroll dough into 1 large rectangle. Press into 12x8-inch rectangle, firmly pressing perforations and seams to seal. Using pizza cutter, cut dough into 6 rows by 4 rows, to make 24 squares of dough.
3Gently press squares into mini muffin cups and three-fourths of the way up sides.
4Add 3/4 teaspoon artichokes, 1 heaping teaspoon spinach, a couple of pieces of tomato and a sprinkle of feta cheese to each cup.
5Bake 11 to 13 minutes or until dough is deep golden brown. Let stand 1 minute in muffin cups. Remove from muffin cups with fork. Serve warm.