Cheesy Squash Casserole

By Dawn P

4.25 / 5

35min

35min

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2 tablespoons butter divided
2 cups thinly sliced zucchini
2 cups thinly sliced yellow squash
1 (8 ounce) package baby bella mushrooms sliced
1 small white onion thinly sliced
2 cloves garlic minced, or more to taste
1 (5 ounce) package baby spinach leaves
2 cups crushed buttery round crackers (such as Ritz®)
½ cup butter melted
2 plum tomatoes seeded and thinly sliced
1 (4 ounce) jar diced pimento peppers drained
½ cup mayonnaise
¼ cup sliced green onion
½ teaspoon dried oregano
½ teaspoon dried basil
½ teaspoon salt
½ teaspoon ground black pepper
1 cup shredded sharp Cheddar cheese
1 cup shredded Parmesan cheese