Whisk together flour, 1 teaspoon salt, and pepper on a large shallow plate. Set aside.
Beat eggs and milk together in a medium sized bowl. Set aside.
Whisk together panko, remaining 1 teaspoon salt, Italian seasoning, basil, and 1/2 cup parmesan cheese on another large shallow plate. Set aside.
Bread breasts in flour, eggs, then breadcrumb mixture, then place them onto a clean work surface. Don’t be shy - there’s plenty of each breading mixture!
Heat 1/4 cup olive oil in a large skillet over medium-high heat.
Working with 2 breasts at a time, cook chicken until golden brown, about 1-2 minutes on each side.
Repeat with remaining chicken breasts, adding oil to the sauté pan, if needed.
Grease a 6 quart crockpot with cooking spray, then pour half the sauce into the bottom.
Top with seared chicken breasts, then pour remaining sauce on top.
Cover and cook on LOW for 6-8 hours or HIGH for 3-4 hours.
Uncover the crockpot and top with sliced provolone, shredded mozzarella, and remaining 1/4 cup parmesan.
Recover and cook until cheese is melted, about 15 minutes.
Taste and re-season, if necessary (I added more salt).
Serve on top of cooked pasta with extra sauce, if desired.
Take 5 seconds to . We greatly appreciate it!