Beef and Broccoli Casserole

A one-pot family favorite: this Beef and Broccoli Casserole combines tenderized flank steak, plenty of vegetables, and a savory-sweet homemade Asian brown sauce. It’s an easy alternative to traditional stir-fry—no wok, no last-minute pan cooking. Everything goes into the casserole dish raw and bakes together for a simple, satisfying meal.

Why you’ll love this recipe

Perfect for meal prep: Makes about 6 servings and stores well in airtight containers for several days.
All the familiar flavors: If you enjoy classic beef and broccoli, this casserole delivers the same Asian-style flavor profile with less hands-on work.
One-dish convenience: No stir-frying required—assemble raw ingredients, pour the sauce, bake, and serve.
Balanced dinner: Each serving includes protein, vegetables, and rice; swap in instant brown rice for a whole-grain option.

Why tenderize the flank steak?

Flank steak benefits from tenderizing so the baked dish isn’t chewy. Place the steak between parchment paper and use a meat mallet to pound it to roughly 1/2 inch thick before slicing. This breaks down tough fibers and helps the meat cook evenly inside the casserole.

All about the vegetables

This casserole centers on broccoli but plays well with other vegetables. Cut broccoli into small, bite-sized florets so everything cooks evenly and is easy to eat. Finely dice onion and bell pepper so they soften during baking and meld with the sauce.

Broccoli: Bite-sized florets, about 6–8 cups total from 2 heads.
Onion: Half a medium onion, finely diced.
Red pepper: One large red bell pepper, finely diced for color and sweetness.

Other veggie ideas

Cauliflower florets
Sugar snap or snow peas
Green beans
Sliced green onions for garnish
Water chestnuts for crunch

Beef and Broccoli Sauce

The sauce balances salty, sweet, and a touch of heat. Beef broth gives it depth while soy and hoisin provide the classic Asian notes. Maple syrup adds a mild sweetness that complements the savory ingredients.

Key sauce ingredients: soy sauce, hoisin sauce, minced garlic, maple syrup, red chili sauce, beef broth, and water. Adjust the red chili sauce to make the casserole milder or spicier to taste.

How to make this gluten-free

To make a gluten-free version:

Soy sauce: Substitute tamari (gluten-free tamari) or a gluten-free soy alternative. Tamari can be a bit saltier—if needed, dilute with a tablespoon or two of water.
Hoisin sauce: Either omit and add an extra 2 tablespoons of maple syrup for sweetness, or use a certified gluten-free hoisin sauce if available.

Storage and freezing

Keep leftovers in an airtight glass container in the refrigerator for up to 5 days. For longer storage, freeze the casserole: cool completely, wrap tightly to remove air (use foil or freezer-safe containers), and freeze up to 3 months. Thaw overnight in the refrigerator before reheating.

How to reheat

Microwave: Place a serving in a microwave-safe dish and heat on high for 1½–2 minutes, stirring once if needed.
Stovetop: Transfer the portion to a nonstick skillet and sauté over medium-high heat for 3–5 minutes until warmed through.

Recipe details

Servings: 6 • Prep: 20 minutes • Cook: 50 minutes • Total: 1 hour 10 minutes

Ingredients

2 cups minute/instant white rice (or minute/instant brown rice)
2 heads broccoli florets, cut into bite-sized pieces (about 6–8 cups)
1 large red pepper, finely diced
1/2 medium yellow onion, finely diced
1/3 cup soy sauce (or tamari for gluten-free)
3 tablespoons hoisin sauce (use gluten-free if needed)
1 tablespoon minced garlic
1 tablespoon maple syrup
2 teaspoons red chili sauce (adjust to taste)
1 1/2 cups beef broth
1 cup water
1 lb flank steak, tenderized and cut into 1/2-inch pieces

Instructions

Preheat the oven to 375°F (190°C). Lightly spray a 9 x 13-inch casserole dish with nonstick spray.
Spread the instant rice evenly across the bottom of the casserole dish.
Add the broccoli florets, diced red pepper, and diced onion on top of the rice.
In a bowl, whisk together soy sauce, hoisin, minced garlic, maple syrup, red chili sauce, beef broth, and water to make the sauce.
Place the flank steak between two pieces of parchment and pound to about 1/2-inch thickness. Slice into 1/2-inch pieces and add the beef to the casserole dish over the vegetables and rice.
Pour the prepared sauce evenly over the meat, vegetables, and rice. Gently stir with a large spoon so the rice and vegetables are distributed, then smooth the top.
Cover the dish tightly with foil and bake at 375°F for 20 minutes. Remove, stir gently, cover again, and bake another 15 minutes.
Uncover and bake an additional 10–15 minutes until the beef is cooked through and the rice is tender. If the rice is still a bit crunchy, continue baking a few minutes longer, checking frequently.
Let the casserole rest for 5–10 minutes so the sauce finishes absorbing. Serve warm.

Nutrition (per serving)

Calories: 325 kcal • Carbohydrates: 44 g • Protein: 24 g • Fat: 6 g • Fiber: 3 g • Sugar: 8 g

Nutrition information is an approximation and should be used as a guideline only.

Cook’s tips and variations

For a whole-grain boost, use instant brown rice in place of white minute rice.
If you prefer a saucier casserole, increase the beef broth by 1/4 cup and adjust seasoning as needed.
To cut down sodium, choose a low-sodium soy sauce or reduce the amount and add a splash of water to balance flavors.
Garnish with sliced green onions or sesame seeds just before serving for added freshness and texture.

Related recipe ideas

Instant Pot Beef and Broccoli
Chicken and Broccoli Stir Fry
Honey Ginger Chicken Stir Fry
Stuffed Pepper Steak Quinoa Casserole
Healthy Hamburger Casserole
No-Mess Taco Casserole