Cook noodles. Cook Chicken, season as desired, shred in pan
Filling: Stir Chicken, Pesto, Ricotta, Truffle Oil, and 1/4 cup Mozzarella together
Working with one Lasgna noodle at a time. Place 1/3 cup of Filling onto the noodle. Spread to cover and roll up noodle, set aside. Repeat for all filling and noodles
White Sauce: Melt Butter in saucepan, add Flour and whisk to combine. Gradually add Milk, whisking constantly. Raise heat and whisk until sauce thickened. Remove from heat
Add half of White Sauce to baking pan. Place prepared rolls into pan. Pour remaining White Sauce over rolls and then top with Marinara Sauce. Put remaining cheese on top
At this point you can put this in the fridge overnight or bake right away
Bake at 375F for 25 to 30 minutes until cheese has browned and sauce is bubbling