Preheat the oven to 350°F and line a baking sheet with parchment paper.

In a large bowl, beat the peanut butter, softened butter, brown sugar, and granulated sugar until light and creamy.

Mix in the egg and vanilla extract until smooth.

Add the flour, baking soda, and salt, then stir just until a soft dough forms.

Scoop the dough into 24 even portions, roll gently, and place them on the prepared baking sheet with space between each one.

Bake for 9 to 11 minutes, until the edges are lightly golden and the centers are still soft.

Let the cookies cool on the pan for 2 minutes, then gently press one marshmallow half onto each cookie.

Allow the cookies to cool completely so the topping stays in place.

Spoon or pipe white icing around each marshmallow to create the melted snow look.

Add mini chocolate chips for the eyes and mouth, then finish with an orange sprinkle piece or a small dot of orange gel for the nose.

Let the decorations set before serving or storing.