To prepare a tuna quiche in rice crust cheese recipe, you will first need to prepare the filling. To do this, first, heat 2 tablespoons of olive oil over medium-high heat. Then, add 1 tablespoon of minced garlic and 1 teaspoon of oregano to the oil and cook, stirring, until the garlic is fragrant, about 1 minute. Add 1 cup of chopped scallions and 1/4 cup chopped parsley and stir to combine. Season with salt and pepper to taste. Pour the mixture into an oiled 9-inch pie pan and bake in the oven for 20 to 25 minutes or until browned. Remove from oven and allow to cool for 5 minutes before cutting into squares and serving.