I had a similar thing with Ava. And then she wouldn't eat her breakfast. What I do now is when she wakes up I give her a sippy cup of milk and then just let her do whatever. Watch some cartoons or read or play and then after about 1/2 - 45 mins give her breakkie. Now there aren't any tantrums and she eats all her brekky. Think she's like me and just can't eat the minute she wakes up