Allow the butter to soften at room temperature until pliable for easier handling. This will ensure that the cookie dough has a smooth and homogeneous consistency.
In a large mixing bowl, cream together the butter and powdered sugar until light and fluffy. You can use a hand whisk or an electric mixer for ease.
Add the vanilla extract, salt, and egg, then mix thoroughly until you have a uniform mixture.
Gradually sift in the flour and mix with a spatula or by hand until a formable, non-sticky dough is formed.
Divide the dough into smaller portions, then place a small dollop of peanut butter in the center of each. Reshape into balls, ensuring the filling remains inside.
Gently flatten the filled dough balls to create cookie shapes.
Preheat the oven to 350°F (180°C) and line a baking sheet with parchment paper.
Place the cookies on the parchment-lined baking sheet, leaving enough space between them, as they will expand slightly during baking.
Bake the cookies in the preheated oven for about 10-12 minutes, or until the edges are lightly golden brown.
Let the cookies cool completely on a wire rack, then serve or store in an airtight container.
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