- 1 (12 ounce) package frozen butternut squash
- 1/2 cup melted butter
- 1 1/2 cups milk
- 3 eggs
- 1/2 cup white sugar
- 1/2 cup all-purpose flour
- 1/2 teaspoon vanilla extract
- 1 pinch ground cinnamon, or to taste
- Preheat oven to 350 degrees F (175 degrees C).
- Place unopened frozen squash package on a microwave-safe plate with directions side up. Cook on high, 4 to 6 minutes. Rest in microwave, 1 to 2 minutes. Carefully remove plate from microwave. Mix squash and melted butter together in a bowl.
- Stir milk, eggs, sugar, flour, and vanilla extract together in a pan until combined; add squash mixture. Sprinkle cinnamon across the top.
- Bake in the preheated oven until top is golden brown, about 1 hour.