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1
Preheat oven to 350 degrees.
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2
Place lasagna noodles in a 9x13 pan.
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3
Fill pan with hot water and a drizzle of olive oil and let noodles soak while preparing the other ingredients (omit this step if using oven-ready lasagna noodles).
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4
In a large saucepan, whisk together chicken broth, flour, thyme and 1/4 teaspoon each of basil and oregano.
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5
Bring to a boil over medium-high heat, stirring constantly.
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6
Reduce heat and allow sauce to simmer and thicken while preparing chicken and vegetables.
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7
Heat olive oil in a large skillet over medium-high heat.
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8
Add cubed chicken, remaining 1/4 teaspoon each of basil and oregano, and salt and pepper to taste.
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9
Saute until chicken is cooked through, about 5 minutes.
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10
Transfer chicken to a plate.
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11
In the same skillet, melt the butter, then add the chopped onion, garlic and carrots.
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12
Cook and stir until vegetables are tender.
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13
Add the chopped tomatoes and frozen spinach and cook until heated through.
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14
Return chicken to skillet with vegetables.
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15
Spread a scant cup of the thickened chicken broth in the bottom of a greased 9x13 inch baking dish.
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16
Top with a layer of noodles.
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17
Spread 1/3 of chicken and vegetable mixture over noodles.
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18
Top with 1/3 of the thickened broth (about 2 cups), followed by 1/3 of the mozzarella cheese.
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19
Repeat twice, ending with a layer of mozzarella cheese.
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20
Top with 1/2 cup Parmesan cheese.
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21
Bake, uncovered, for about 45 minutes, until lasagna is bubbly and cheese is golden brown.
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22
Let rest 10 minutes before serving.