Preheat oven to 375° F. Place tart shells on Sheet Pan. Bake for 10–12 min or until golden.
Meanwhile, cut avocados in half; discard pits. Scoop flesh into a food processor or high-speed blender. Add spinach. Cut lime in half; using the 2 in 1 Citrus Press, squeeze in juice from lime. Add coconut oil, and salt; purée until smooth.
Remove tarts from foil cups. Let cool, then spoon in avocado filling. Generously shake on topper. Arrange on a platter and serve.