Chicken Florentine Casserole

8 skinless, boneless chicken breast halves
1/2 cup canola oil
2 tablespoons minced garlic
2 tablespoons lemon juice
3 (13.5 ounce cans) coconut milk
2 tablespoons Italian seasoning
1 cup grated Parmesan cheese
4 (13.5 ounce) cans/packages spinach, drained
3/4 pound fresh mushrooms, sliced
1-1/3 cups bacon bits
1 cup shredded coconut
1 cup chopped walnuts
1 egg