Grease the bottom of the crock pot. Layer half the tater tots on the bottom of the pot. Sprinkle half the bacon pieces on top of the tater tots. Combine the 2 cheeses and sprinkle 1/3 of it over the bacon and tots. Top cheese with the chicken breasts. Sprinkle chicken with salt and pepper to taste.
Top chicken with another 1/3 of the cheese. Sprinkle with remaining half of the bacon pieces. Add remainder of the tater tots. Top with final 1/3 of the cheese. Pour milk over the top.
Set crock pot on high and cook 3 hours.
Do not double, will not fit in the slow cooker.