Hi Loll
There could be a few reasons why you have an eggy layer. Firstly your eggs may not have been mixed in thoroughly or long enough, which could cause you to have a scrambled egg layer effect on your Bakewell. If your butter has been too warm, this may also cause the batter to curdle and create scrambled eggs. Baking on too high a heat could also bake your filling too quickly and cause you to have a scrambled egg result. When baking a tart always have it on a moderate heat and bake slowly.
For a Bakewell filling ensure you split your egg whites and yolk, I'm not sure how you made yours, but I always mix the butter, sugar, egg yolks and essence into a mixing bowl and cream together using an electric whisk. Once that's combined I...