Bring a large pot of salted water to a rolling boil over high heat. Once boiling, add ¾ pound of your favorite pasta. Cook according to the package instructions, typically around 8-10 minutes, or until the pasta reaches al dente texture.

In a medium saucepan, melt 2 tablespoons of butter over medium heat. Whisk in 2 tablespoons of flour, cooking for about 2 minutes until the mixture is smooth and lightly bubbly but not browned.

Gradually pour in 1 cup of milk while continuously whisking to avoid lumps. Stir constantly for about 3-5 minutes until the sauce thickens and coats the back of a spoon.

Add ½ to ¾ cup of pesto to the saucepan. Mix well and remove from heat.

Drain the cooked pasta and return it to the pot. Pour the creamy pesto sauce over the pasta, stirring gently to coat.

Serve immediately while hot. Optionally, top with cooked protein like chicken or shrimp, or fresh veggies.