Speedy Stir-Fried Garlic Beef with Bell Peppers

By AislePrompt Editorial · Published 2026-06-09 · Updated 2026-06-09

Tender strips of beef quickly stir-fried with colorful bell peppers and a savory garlic sauce, ideal for a fast and flavorful dinner. This Asian-inspired stir-fry recipe (high protein), ready in about 20 minutes, pairs flank steak, red bell pepper, yellow bell pepper for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 350 calories and feeds 3, so it slots cleanly into a weekly meal plan and pairs well with a quick salad or grain on the side. Tap "Plan a meal with the AI" below to drop this recipe into your week and send the ingredients straight to Instacart. Nutrition values are approximate, calculated from USDA FoodData Central (fdc.nal.usda.gov) — verify against ingredient labels for any health-driven dietary plan.

Ingredients

• 12 oz, thinly sliced against the grain flank steak
• 1 large, sliced into thin strips red bell pepper
• 1 large, sliced into thin strips yellow bell pepper
• 4 cloves, minced garlic cloves
• 3 tbsp soy sauce
• 2 tbsp oyster sauce
• 1 tsp sesame oil
• 2 tbsp vegetable oil
• 1 tsp cornstarch
• 1/4 tsp black pepper
• 2 stalks, sliced for garnish green onions

The wok we’d stir-fry this in → Best Woks for 2026: Carbon Steel, Nonstick & Flat-Bottom Picks + Buying Guide

Instructions

1. Step 1: Toss 12 oz thinly sliced flank steak with 1 tsp cornstarch and 1/4 tsp black pepper in a bowl until evenly coated.
2. Step 2: Heat 2 tbsp vegetable oil in a large wok or skillet over high heat until shimmering. Add the beef strips and stir-fry for 2-3 minutes until just browned but still tender. Remove beef and set aside.
3. Step 3: In the same pan, add 4 minced garlic cloves and sauté for 30 seconds until fragrant. Add 1 large sliced red bell pepper and 1 large sliced yellow bell pepper, stir-frying for 3-4 minutes until peppers are slightly tender but still crisp.
4. Step 4: Return the beef to the pan and add 3 tbsp soy sauce, 2 tbsp oyster sauce, and 1 tsp sesame oil. Stir-fry everything together for 1-2 minutes until the sauce thickens and coats the beef and peppers.
5. Step 5: Remove from heat and garnish with 2 sliced green onions before serving immediately.