Florentine Brunch Casserole
["16 slices firm white bread", "3 Tbsp. butter or margarine, divided", "1 (10 3/4 oz.) can condensed cream of celery soup", "1/3 c. milk", "1/4 tsp. coarsely ground black pepper", "1/3 c. finely chopped onion", "1 red bell pepper, diced (about 1 c.)", "1/2 c. (4 oz.) diced cooked deli ham", "10 eggs, lightly beaten", "1 c. (4 oz.) shredded Cheddar cheese, divided", "1 (5 oz.) pkg. fresh spinach leaves, washed and stemmed"]
["Preheat oven to 375\u00b0.", "Cut crusts off bread using serrated bread knife.", "Cube crusts to measure 2 cups.", "Arrange bread slices in an overlapping pattern against sides of Oval Baker; place bread cubes in bottom.", "Place 2 tablespoons of the butter in Small Micro-Cooker; microwave, covered, on High 30 seconds or until melted.", "Lightly brush butter over bread slices using Pastry Brush.", "Bake 15 to 20 minutes or until edges of bread are golden brown."]
["white bread", "butter", "condensed cream", "milk", "ground black pepper", "onion", "red bell pepper", "eggs", "Cheddar cheese", "fresh spinach leaves"]