The phrase "a layer of apples" is correct and usable in written English.
It can be used when describing a physical arrangement or presentation of apples, such as in cooking, serving, or storage contexts.
Example: "For the dessert, we arranged a layer of apples on top of the cake to add flavor and decoration."
Alternatives: "a stack of apples" or "a tier of apples".
Add a layer of apple compote and top with the nutty crunch.
In an ovenproof pot (preferably glazed ceramic) 8 inches in diameter and 5 inches deep, layer ingredients compactly as follows: a layer of onions and bacon, 3 chops, a layer of apple slices, some more onions and bacon, the final 3 chops, a layer of apple slices, remaining onions and bacon, and a final layer of apples.
He unmolds a rectangular piece of apple yuzu gelée on a plate, then with a tweezer adds a layer of poached apple spheres, on top of which he places a piece of hazelnut cake that has been baked in an individual pan — made in his own machine workshop — so that a hollow channel runs through the center.
The top of the cling film was covered with a layer of either apple sauce or yoghurt.
Line the pie crusts with a layer of thin apple slices sprinkled with cinnamon before pouring in the filling if you want a different flavor profile.
Last month, wandering through Portland on my first stateside visit, I stumbled into a bakery (I can't walk by one without at least pressing my nose against the glass) and bought perhaps the best pastry I've ever eaten: filled with a thick layer of apples slow-roasted in cider to a sticky, caramelised puree.
Place a second layer of apples on top, cored-side down, and press gently with your hands coaxing them to fit together like a puzzle.
Place a layer of the sliced apples in a baking dish, sprinkle with sugar, dot with butter, or pour on a little melted butter.
As for desserts, I would say skip them, whether it is the commercial-tasting chocolate mousse cake or the apple caramel (a wedge of impenetrable sugary sweet topping with a thin layer of apple and a thick cardboard-like crust).
If you're feeling more ambitious, try this "bonfire clafouti": cover the bottom of a cast-iron casserole dish with a layer of pear or apple halves, make a thick batter using a packet sponge cake or muffin mix, and pour over the fruit.
