To prepare a sweet spinach tart desserts recipe, you will first need to prepare the ingredients for the tart. Place the flour, sugar, salt, and baking powder in the mixing bowl. Add the butter and mix until the mixture resembles coarse crumbs. Pour the wet ingredients into the dry ingredients and stir until they are evenly coated. Cover the dough with plastic wrap and refrigerate until firm, at least 1 hour. Preheat the oven to 375?F (190?C) and bake for 20 minutes. Remove the crust from the pie shell and sprinkle with shredded Parmesan cheese. Bake for an additional 10 to 15 minutes or until crust is golden brown and cheese is melted. Serve warm or at room temperature.