Step 1

Pour olive oil in the bottom of the slow cooker.

Step 2

Place beaten egg in a shallow bowl.

Step 3

Mix bread crumbs, Parmesan, oregano, garlic powder, pepper, and salt in a second shallow bowl.

Step 4

Dip chicken breasts in egg and then in bread crumb mixture, coating both sides.

Step 5

Place breaded chicken in the crockpot and top each with a slice of mozzarella.

Step 6

Pour marinara sauce over chicken.

Step 7

Cook on high for 4 hours.