What are good safe ways to increase calorie intake?

WeaponZero
Ever since I started working on getting more fruits and vegetables in my diet I've been coming in at roughly 1200-1500 calories per day. I should be getting 2300. Any suggestions on how to increase my calorie intake without adding unhealthy foods to my diet or increasing the amount of food I eat (since I eat quite a lot and there isn't much room for more)?

My diet right now consists mainly of whole grain pasta, brown rice, chicken breasts, egg whites, fish, fruits and vegetables. When I eat beef its the 93% lean stuff.
What are good safe ways to increase calorie intake?
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