Portobello Steaks Au Poivre

Ingredients

• 4 large portobello mushrooms (4 to 5 ounces each)
• 1 large shallot
• 4 cloves garlic
• 6 tablespoons (3/4 stick) unsalted butter, divided
• 1 heaping tablespoon whole peppercorn blend, or 1 teaspoon each whole black, red/pink, white, and green peppercorns
• 1 teaspoon garlic powder
• 1 teaspoon onion powder
• 1/4 cup plus 2 tablespoons vegetable or canola oil, divided
• 5 sprigs fresh thyme
• 1 teaspoon kosher salt, divided
• 1/4 cup Cognac
• 1/2 cup low-sodium vegetable broth
• 1/2 cup heavy cream

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