Heat a large saucepan. Add oil; add the fresh mushrooms and cook until they are softened and browning at the edges. Stir in the garlic once the mushrooms are browning at the edges.
Then you can add the arborio rice and stir constantly for 3 minutes. Add the white wine and and stir occasionally on medium to medium-low heat until it has absorbed.
Add simmering stock. Stir often, until the broth is almost absorbed. Repeat , stirring often and add more broth when rice is almost dry for at least 15 minutes.