Rachael Ray's Protobello Burgers with Creamed Spinach

Again, I love every ingredient in that title - including RR!! "The meaty mushrooms act as a canvas for any flavor you'd like to incorporate. Creamed spinach gives it a real steakhouse vibe."
(serves 4)

1 T. unsalted Kerrygold* butter
1/4 cup plus 1 T. EVOO, divided
1 large shallot, minced
1 garlic clove, minced
1&1/2 T. all-purpose flour
3/4 cup whole milk
1 (9 oz.) pkg. frozen chopped spinach, thawed and wrung out in a kitchen towel
Pinch of ground nutmeg
3/4 t. kosher salt, divided, plus more to taste
3/8 t. freshly* ground pepper
2 oz. (1/4 cup) Parmiagiano-Reggiano cheese, shredded
2 T. Worcestershire sauce
2 T. balsamic vinegar
2 T. finely chopped fresh rosemary
4 (3 oz.) portobello mushroom caps, brushed clean with a damp towel, gills removed
1/2 lb. fresh mozzarella cheese, thinly sliced
4 crusty rolls
Thinly sliced red onion, for garnish

Heat butter and 1 T. oil in a med. skillet over med.-high until melted. Add shallot and garlic; cook, stirring often, until softened, about 2 min. Sprinkle with flour; cook, stirring constantly, until smooth, about 30 sec. Gradually whisk in milk. Bring to a simmer, stirring occasionally. Stir in nutmeg, 1/2 t. salt, and 1/4 t. pepper, and add spinach. Cook stirring often, until heated through, about 2 min. Stir in Parm -Reg. cheese. Reduce heat to low; cover, and stir occasionally while making burgers. Combine Worcestershire sauce, vinegar, rosemary, and remaining 1/4 cup oil in a large ziplock bag. Add portobello caps; seal bag, and tilt to coat. Preheat grill to med.-high. Shake marinade off portobellos; discard marinade. Cook portobellos, gill side down, until charred, 4-5 min. Turn mushrooms, and sprinkle with remaining S&P. Top with mozzarella. Cook until mushrooms are tender, 4-5 min. Remove from heat, and tent burgers loosely with foil. Let stand until cheese melts, 1-2 min. Place 1 mushroom cap on bottom half of each roll Top each with about 1/4 cup cream spinach, and a few onion slices. Cover with top halves of rolls, or serve open face.

"So many men think women want money, cars, and gifts. But the right woman wants a man's time, effort, passion, honesty, loyalty, smile, and him choosing to put her as his priority."

Whew, I am finally caught up on blogs from my computer being down for so long!!

Love,

MM