Heat oven to 400 degrees F (200 degrees C). Then, lightly spray 20 mini muffin cups with cooking spray.Form pizza dough into a 14-inch by 12-inch rectangle (this doesn’t have to be exact, just close).Then, use a 2 1/2-inch round cookie cutter to cut out 20 circles of dough. Press each circle of dough into the muffin cups. Now, use a fork to pierce the bottom of each pizza cup. Three to four pricks with a fork should do it. (This will help prevent the bottoms of the pizza cups from rising).Bake pizza cups 8 to 10 minutes or until edges are light golden brown. Transfer cups to a cooling rack then cool completely.Once cooled, fill each pizza cup with a heaping teaspoon of hummus, and then top with a few pieces of cucumber and a tomato quarter.Finish with a light sprinkle of salt.