Bring a large pot of salted water to boil, add noodles and cook until done about 6 to 7 minutes or according to package directions. Meanwhile, finely dice your cheddar and brie into 1/4-inch cubes. Combine the cheeses with the white wine and ricotta in the top of a double boiler or in a microwave proof container that is large enough to accommodate the cooked pasta. If you are using a double boiler, melt the cheese while the pasta is cooking, if you are using a microwave you can wait until the pasta is done. When the pasta is done, drain, pat dry, and toss it with the melted cheese. Or is you are using a microwave oven, heat the cheese for 1 minute. Whisk it vigorously and return it to the microwave for 20 seconds. Add the drained pasta to the melted cheese, right in the microwave dish, and toss. Season with lots of freshly ground pepper and scallion.