Cook elbow noodles according to package directions and drain.
In a large skillet, melt 1 tablespoon of butter. Add 1 tablespoon of flour and mix until thick and bubbly (but not burned!).
Add 1/2 cup of milk and stir till it begins to bubble again.
Add 1/2 cup summer squash puree, and stir till fully smooth and mixed in. Add cream cheese and mix until smooth. Add salt. Add the cooked macaroni to your thickened cheese sauce.
Top with shredded cheddar or our favorite, Colby Jack! (based on Deceptively Delicious Macaroni and Cheese 1)