Brush the tops of each baguette sliced with the 2 Tbsp of olive oil and broil until golden.

Add the remaining 2 Tbsp oil to skillet and saute shallots until tender, add mushrooms and garlic and saute until mushrooms turn golden brown. Reduce heat to medium-low, add oregano, cream and zest, stirring until mixture is thoroughly mixed and begins to thicken slightly. Stir in balsamic and season to taste with salt and pepper.

Spoon some of the mixture on top of each toasted baguette slice, then top with the cheese.