Home » Recipes » Portobello Spinach Burgers Suggestions? Portobello Spinach Burgers - Recipe Cost Cost information for the following is not included. Normally this is because the quantity or ingredient is unknown Ingredients Per Serving Qty Common Price Price per Serving ¼ cup balsamic vinegar 1 tablespoon $6.59 per 17 fluid ounces $0.19 2 tablespoons olive oil 1 1/2 teaspoons $5.99 per 16 fluid ounces $0.09 ½ teaspoon cumin 1/8 teaspoon $1.69 per 1 1/4 ounces $0.01 1 tablespoon minced garlic 3/4 teaspoon $4.00 per pound $0.02 4 portobello mushroom caps 1 portobello mushroom $1.99 per pound $0.37 cooking oil spray 1/4 oil spray $2.99 per 6 ounces $0.00 1 large onion, sliced 1/4 onion $0.79 per pound $0.07 4 cups fresh spinach 1 cup $3.99 per pound $0.26 4 slices Swiss cheese 1 slices $2.59 per 8 ounces $0.32 4 rolls or sandwich pockets 1 rolls n/a Total per Serving $1.34 Total Recipe $5.35 Please Log In or Sign Up to edit Recipe Cost info Email Recipe Cost Send To Message (if any) or Close