Here is a calculator https://my.whisk.com/nutrition-calculator that allows you simply to insert the URL to the recipe itself (in this case, the Low Calorie Italian Casserole), and the site grabs each ingredient and quantity, and provides all the macros, calories, and other data, per ingredient. You would need to add them up and then divide by however many servings you think you'll have, based on size.
You can figure the serving size, once you've made the casserole, by weighing it, subtracting the weight of your baking dish, and then dividing that result by the number of servings you plan to get from the dish. The recipe says it serves 5. ;o)
Most of the recipes here at Food52 were written by community members. If the nutritional data isn't included with the recipe, you have to plug the ingredients into a nutritional calculator yourself to figure this out. This is not specific to Food52 or even just food websites, it's also valid for recipes that you find in print (magazines, cookbooks, food packaging, etc.).
There are plenty of nutritional calculators online; bookmark a few so you'll have them handy when you need to do this next time. There are also some applications you can run on a computer (or likely on smartphones). I have no recommendations either way.
Note that in this specific instance some of the ingredients can have wildly differing nutritional values, particularly the marinara sauce which can be loaded with sodium and sugar depending on the brand/product. The numbers generated from a nutritional calculator should always be taken with a grain of salt for that reason.
If you are using a bunch of packaged products, you are better off including the nutritional data from that packaging into the calculation yourself rather than picking a generic ingredient item (e.g. "marinara sauce") which likely has values that don't match the specific product sitting on your kitchen counter.
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You can figure the serving size, once you've made the casserole, by weighing it, subtracting the weight of your baking dish, and then dividing that result by the number of servings you plan to get from the dish. The recipe says it serves 5. ;o)
There are plenty of nutritional calculators online; bookmark a few so you'll have them handy when you need to do this next time. There are also some applications you can run on a computer (or likely on smartphones). I have no recommendations either way.
Note that in this specific instance some of the ingredients can have wildly differing nutritional values, particularly the marinara sauce which can be loaded with sodium and sugar depending on the brand/product. The numbers generated from a nutritional calculator should always be taken with a grain of salt for that reason.
If you are using a bunch of packaged products, you are better off including the nutritional data from that packaging into the calculation yourself rather than picking a generic ingredient item (e.g. "marinara sauce") which likely has values that don't match the specific product sitting on your kitchen counter.
Best of luck.