Cook Meat In A Skillet Over Medium Heat Until Browned, Stirring To Crumble. Drain In Collander And Pat Dry With Paper Toweling. Slice Bread In Half Length-Wise; Place On Baking Sheet, Cut Side Up. Spread Evenly With Tomato Paste; Sprinkle With 1/2 Tsp Oregano. Top With Mushrooms; Top With Cheese. Sprinkle With Remaining 1/2 Tsp Oregano. Broil, 6 Inches From Heat For About 2 Minutes Or Till Cheese Has Melted. Protein 12.3 / Fat 6 / Carbohydrate 42.4 / Cholesterol 17 Iron 2.7 / Sodium 505 / Calcium 87