How to Make It
Preheat oven to 375°.
Place half of mushrooms in a food processor; process until minced. Place minced mushrooms in a bowl. Repeat procedure with remaining mushrooms. Rinse and wipe processor clean.
Heat a large skillet over medium-high heat. Add oil to pan; swirl to coat. Add onion; sauté 3 minutes. Add garlic; sauté 1 minute. Add mushrooms; cook 7 minutes or until liquid evaporates and mushrooms begin to brown. Add sherry; cook 1 minute, stirring frequently. Remove from heat; stir in thyme. Cool slightly.
Combine mushroom mixture, panko, and next 4 ingredients (through egg), mixing until well combined. Shape mixture into a 7 x 3-inch free-form loaf on a foil-lined baking sheet coated with cooking spray. Bake at 375° for 20 minutes. Remove from oven; brush with half of ketchup. Bake an additional 10 to 15 minutes or until a thermometer registers 160°. Remove from oven; brush with remaining ketchup. Cut into 8 slices.
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