Preheat oven to 350º F (180º C).
Butter the inside of a pie dish, or similar sized baking dish.
If using fresh peaches, score a short line with a knife at the bottom of each peach. Gently add the peaches to a pot of boiling water using a spoon and remove after about 45 seconds. Immediately plunge into an ice bath.
The peaches' skin will now peel off easily using the scored line as a starting point.
Slice the peaches and keep them in a bowl. (Be sure to drain the peaches if you're using canned.)
Squeeze about 1 teaspoon of fresh lemon juice onto the peaches.
Stir the cornstarch into the sugar, and add it to the peaches in the bowl; mix gently.
Place the sweetened peaches into the buttered pie dish.
Sift the flour and baking powder into a bowl so that they are evenly mixed.
Cream the sugar and butter until light and fluffy. Beat in the egg, then gently fold in the flour and baking powder until well combined, without overmixing.
Drop large spoonfuls of the dough onto the peaches in the pie dish.
Bake for 35 to 45 minutes (depending on your oven) or until the topping is baked through, and golden brown.
Remove from the oven. Allow the easy peach cobbler to cool slightly before serving.
