Try this, just for the heck of it. Once you've began incorporating uncooked meals into your food plans, keep including them in and reducing the number of cooked and processed meals from your diet. Especially issues like quick meals, chips, cookies, pizzas, processed dinners and of course snacks. It's difficult I know but possible. You will feel better for it too.
After you've achieved that for awhile, have a junk food day. If you actually miss your junk food, or think you do, then plan for it. Make it actually memorable and junk-worthy.
If we have been playing types, we'd be keen to bet a LOT of money that mid-approach through your junk food day, you'll stop.